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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