Worked Example 1
Sita scored 17 out of 20 in maths and 41 out of 50 in science.
The wholes are differentA mark out of 20 is worth more than a mark out of 50.
Rewrite both out of a hundredMaths 85%, science 82%
AnswerMaths, even though 41 looks larger than 17.
Worked Example 2
A bag costs Rs 800, with a 15% discount.
Find ten per cent first10% is 80, so 5% is 40
Build the fifteen per cent80 + 40 = Rs 120 discount
Take it offRs 680
A faster route85% remains, so 0.85 × 800 = 680 in one step.
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