Question Number 5914 by sanusihammed last updated on 05/Jun/16
$${A}\:{certain}\:{telephone}\:{company}\:{can}\:{get}\:\mathrm{10000}\:{subscribers}\:\:\:{t}. \\ $$$${yearly}\:{rate}\:{at}\:\mathrm{50}\:{naira}\:{each}\:.\:{it}\:{will}\:{get}\:\mathrm{1000}\:{more}\:{subscribers} \\ $$$${for}\:{each}\:\mathrm{1}.\mathrm{00}\:{naira}\:{decrease}\:{in}\:{the}\:{rate}.\:{what}\:{rate}\:{will}\:{yield}\: \\ $$$${the}\:{maximum}\:{yearly}\:{income}\:{and}\:{what}\:{will}\:{this}\:{income}\:{be}\:? \\ $$