Question

A man purchased 15 pens, 12 books, 10 pencils and 5 erasers. The cost of each pen is rs.36, each book is rs.45, each pencil is rs.8, and the cost of each eraser is rs.40 less than the combined costs of pen and pencil. Find the total amount spent?

Answer 1

Cost of each eraser = (36 + 8 -40) = Rs.4
Required amount = 15 * 36 + 12 * 45 + 10 * 8 + 5 * 4
540 + 540 + 80 + 20 = Rs.1180

Answer 2

Given:

A man purchased 15 pens, 12 books, 10 pencils and 5 erasers. The cost of each pen is rs.36, each book is rs.45, each pencil is rs.8, and the cost of each eraser is rs.40 less than the combined costs of pen and pencil.

To find:

The total amount spent.

Solution:

As given, we have,

The cost of one pen = 36 Rs.

So, the cost of 15 pens = 36 × 15 = 540 Rs.

The cost of one book = 45 Rs.

So, the cost of 12 books = 45 × 12 = 540 Rs.

The cost of one pencil = 8 Rs.

So, the cost of 10 pencils = 8 × 10 = 80 Rs.

Now,

the cost of each eraser is 40 Rs. less than the combined costs of pen and pencil.

So,

Combined costs of pen and pencil = 36 + 8 = 44 Rs.

Cost of one eraser = 44 - 40 = 4 Rs.

So, the cost of 5 erasers = 4 × 5 = 20 Rs.

Hence,

The total amount spent is

$= 540 + 540 + 80 + 20$

$= 1180 \: Rs.$

Hence, the total amount spent is 1180 Rs.