By selling a book for Rs.400 a student got two successive profits of 12% and 40% respectively. Then his total profit is a.62%
b.50%
c.55%
d.56.8%

The total profit made by the student is 56.8%

The correct answer is D

Given parameters:

final price in which he book was sold = Rs.400

the first profit made by the student = 12% = 0.12

the final profit made by the student = 40% = 0.4

To find:

To find the total profit made by the student, we have to find the initial cost price of the book.

The cost price of the book before the student made the profit of 40%.

Let this cost price = y

100%y + 40%y = 400

140%y = 400

1.4y = 400

This cost price become the new selling price before the student made the profit of 12%.

The cost price of the book before the student made the profit of 12%.

Let this cost price = x

100%x + 12%x = 285.71

112%x = 285.71

1.12x = 285.71

This is the initial cost price of the book

The total profit made by the student is calculated as;

Thus, the total profit made by the student is 56.8%

Learn more here: link

C 55% hope this helps you

there is no grid

step-by-step explanation:

2x^2+5x+17

your welcome. : )