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Multiplication of Decimals

Chirag spent ...

Question

Chirag spent ₹42 for 5 pens. Estimate the cost of one dozen pens.

A

₹48

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B

₹80

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C

₹120

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D

₹150

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Solution

The correct option is C ₹120
₹42 spent by chirag can be rounded off to ₹40
Cost of one pen = ₹40 ÷ 5
= ₹8
Now we know that in a dozen there are 12 pieces so
Cost of a pen ₹8 can be rounded off to ₹10.
Cost of a dozen = ₹10 x 12
= ₹120

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