Four mark exercise problems III — task. Mathematics State Board, Class 8.

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1. Find the simple interest on

$Rs. \ 5a^2b^2$ for

$4ab$ years at

$7b\%$ per annum.

Answer:

Simple interest

$= Rs.$

$\frac{7}{4}a^3b^2$
$\frac{4}{7}a^3b^4$
$\frac{7}{4}a^3b^4$
$\frac{7}{4}a^2b^4$

2. The cost of a note book is

$Rs. \ 10ab$ . If Babu has

$Rs. (5a^2b + 20ab^2 + 40ab)$ . Then how many note books can be buy?

Answer:

The number of note books Babu can buy is

$\frac{1}{2}a + 2b - 4$
$\frac{1}{2}a - 2b - 4$
$\frac{1}{2}a - 2b + 4$
$\frac{1}{2}a + 2b + 4$

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