Question

If ramu buys books from delhi at 11 books for rs. 10 and sells at 10 books for rs. 12, then find his gain percent.

Answer 1

1 book costs 10÷11=0.91
selling price of 1 book - 12÷10=1.2
profit = 1.2-0.91 = 0.29
profit of 10 books is 0.29×10=2.9
profit percentage = profit÷cost price×100
= 2.9÷10×100
= 29 Rs

Answer 2

Answer:

The gain percent is 32%.

Step-by-step explanation:

Given : If Ramu buys books from Delhi at 11 books for Rs.10 and sells at 10 books for Rs. 12.

To find : His gain percent?

Solution :

The cost of 11 books is Rs.10.

The cost of 1 book is $\frac{10}{11}$

The cost of 10 books is $\frac{10}{11}\times 10=9.09$

The cost price of 10 books is Rs.9.09.

The selling price of 10 books is Rs.12.

Profit = SP-CP

Profit = 12-9.09

Profit = Rs.2.91

Profit% is

$P\%=\frac{P}{CP}\times 100$

$P\%=\frac{2.91}{9.09}\times 100$

$P\%=32.01$

Approximately, The gain percent is 32%.