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  2. Find: (a) 15% of 250 (b) 1% of 1 hour (c) 20% of 2500 (d) 75% of 1 k

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NCERT

Find: (a) 15% of 250 (b) 1% of 1 hour (c) 20% of 2500 (d) 75% of 1 k

Q: 4
Find: (a) 15\% of 250
         (b) 1\% of 1 hour
         (c) 20\%  of Rs 2500
         (d) 75\% of 1 kg

Answers (1)
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M manish

Here per cent implies for (\% \rightarrow \frac{1}{100})

Therefore, 
(a) 15% of 250
15\times \frac{1}{100}\times 250 =\frac{75}{2}
= 37.5

(b) 1\% of 1 hour
 = 1 \% of 60 minutes
=\frac{1}{100}\times 60 =\frac{3}{5}\ min
=\frac{3}{5}\times 60 = 36\ sec

 

 (c) 20\%  of Rs 2500
 =\frac{20}{100}\times 2500 =Rs\ 500

(d) 75\% of 1 kg
We know that 1kg = 1000 gm, therefore, 
\frac{75}{100}\times 1000g=750g
=0.75 kg

 

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