50-50-75-

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Question Number 203955 by mr W last updated on 03/Feb/24

$$\mathrm{50\%}+\mathrm{50\%}=\mathrm{75\%}? \\ $$

Commented by mr W last updated on 03/Feb/24

Commented by Rasheed.Sindhi last updated on 03/Feb/24

$${It}'{s}\:{only}\:{matter}\:{of}\:{way}\:{the}\:{calculator}\:{works}. \\ $$

Commented by SWPlaysMC last updated on 03/Feb/24

Commented by Rasheed.Sindhi last updated on 03/Feb/24

50% =50% of 1(by default 1 is argument)=0.5 50%+50%=(50% of 1)+(50% of (50% of 1)) =0.5+0.25=0.75

$$\mathrm{50\%}\:=\mathrm{50\%}\:{of}\:\mathrm{1}\left({by}\:{default}\:\mathrm{1}\:{is}\:{argument}\right)=\mathrm{0}.\mathrm{5} \\ $$$$\mathrm{50\%}+\mathrm{50\%}=\left(\mathrm{50\%}\:{of}\:\mathrm{1}\right)+\left(\mathrm{50\%}\:{of}\:\left(\mathrm{50\%}\:{of}\:\mathrm{1}\right)\right) \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:=\mathrm{0}.\mathrm{5}+\mathrm{0}.\mathrm{25}=\mathrm{0}.\mathrm{75} \\ $$

Commented by BaliramKumar last updated on 03/Feb/24

Commented by SWPlaysMC last updated on 03/Feb/24

Commented by Frix last updated on 03/Feb/24

There are many bad calculators out there... Some still use the algorithms from the 1980s accounting devices where you simply had to type 120 [+] 10 [%] to get 132 and 120 [×] 3.5 [%] to get 4.2

$$\mathrm{There}\:\mathrm{are}\:\mathrm{many}\:\mathrm{bad}\:\mathrm{calculators}\:\mathrm{out}\:\mathrm{there}… \\ $$$$\mathrm{Some}\:\mathrm{still}\:\mathrm{use}\:\mathrm{the}\:\mathrm{algorithms}\:\mathrm{from}\:\mathrm{the} \\ $$$$\mathrm{1980s}\:\mathrm{accounting}\:\mathrm{devices}\:\mathrm{where}\:\mathrm{you}\:\mathrm{simply} \\ $$$$\mathrm{had}\:\mathrm{to}\:\mathrm{type}\:\mathrm{120}\:\left[+\right]\:\mathrm{10}\:\left[\%\right]\:\mathrm{to}\:\mathrm{get}\:\mathrm{132} \\ $$$$\mathrm{and}\:\mathrm{120}\:\left[×\right]\:\mathrm{3}.\mathrm{5}\:\left[\%\right]\:\mathrm{to}\:\mathrm{get}\:\mathrm{4}.\mathrm{2} \\ $$

Commented by Frix last updated on 03/Feb/24

Btw even wolframalpha has some bugs. i.e. It cannot correctly solve certain polynomes of 3^(rd) degree with 3 real solutions. It gives the Cardano solutions which are wrong in these cases because it doesn′t know the Trigonometric solutions.

$$\mathrm{Btw}\:\mathrm{even}\:\mathrm{wolframalpha}\:\mathrm{has}\:\mathrm{some}\:\mathrm{bugs}. \\ $$$$\mathrm{i}.\mathrm{e}.\:\mathrm{It}\:\mathrm{cannot}\:\mathrm{correctly}\:\mathrm{solve}\:\mathrm{certain}\:\mathrm{polynomes} \\ $$$$\mathrm{of}\:\mathrm{3}^{\mathrm{rd}} \:\mathrm{degree}\:\mathrm{with}\:\mathrm{3}\:\mathrm{real}\:\mathrm{solutions}.\:\mathrm{It}\:\mathrm{gives} \\ $$$$\mathrm{the}\:\mathrm{Cardano}\:\mathrm{solutions}\:\mathrm{which}\:\mathrm{are}\:\mathrm{wrong}\:\mathrm{in} \\ $$$$\mathrm{these}\:\mathrm{cases}\:\mathrm{because}\:\mathrm{it}\:\mathrm{doesn}'\mathrm{t}\:\mathrm{know}\:\mathrm{the} \\ $$$$\mathrm{Trigonometric}\:\mathrm{solutions}. \\ $$

Commented by SWPlaysMC last updated on 03/Feb/24

Commented by SWPlaysMC last updated on 03/Feb/24

The calculator I′m using is CalcES by “tools for student” from Google Play. I′m using the percentage calculation type setting I posted earlier, and I get both solutions. (1 and 0.75) P.S. I do not use WolframAlpha

$$\mathrm{The}\:\mathrm{calculator}\:\mathrm{I}'\mathrm{m}\:\mathrm{using}\:\mathrm{is}\:\mathrm{CalcES}\:\mathrm{by}\:“{tools}\:{for}\:{student}''\:\mathrm{from}\:\mathrm{Google}\:\mathrm{Play}. \\ $$$$\mathrm{I}'\mathrm{m}\:\mathrm{using}\:\mathrm{the}\:\mathrm{percentage}\:\mathrm{calculation}\:\mathrm{type}\:\mathrm{setting}\:\mathrm{I}\:\mathrm{posted}\:\mathrm{earlier},\:\mathrm{and}\:\mathrm{I}\:\mathrm{get}\:\mathrm{both}\:\mathrm{solutions}.\:\left(\mathrm{1}\:\mathrm{and}\:\mathrm{0}.\mathrm{75}\right) \\ $$$$\mathrm{P}.\mathrm{S}.\:\mathrm{I}\:\mathrm{do}\:\mathrm{not}\:\mathrm{use}\:\mathrm{WolframAlpha} \\ $$

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