Question

A vender bought 9 sweets for ₹ 1. At what rate
should he sell it to gain 80%?​

Answer 1

CP of 9 sweets = Rs 1

CP of 1 sweet = Rs $\sf \dfrac{1}{9}$

Gain% = 80%

SP = $\sf \dfrac{CP(100+Gain\%)}{100}$

SP = $\sf \dfrac{\dfrac{1}{9}(100+80)}{100}$

SP = $\sf \dfrac{\dfrac{1}{9}\times 180}{100}$

SP = $\sf \dfrac{20}{100}$

SP of 1 sweet = Rs 0.20

SP of 9 sweets = Rs 0.20 × 9 = Rs 1.80