Question

A man purchased 150 pens at the rate of 12 per pen. He sold 50 pens at a gain of 10%. At what gain per cent
must he sell the remaining pens, so as to gain 15% on the whole transaction?​

Answer 1

Step-by-step explanation:

alligation

10% x%

15%

x-15% 5%

50 pens 100pens

x-15/5 = 50/100

x-15/5 =1/2

2x-30 =5

x=35/2=17.5%

he has to gain 17.5%