A typist can type $45$ words per minute. He increases his speed by $20$ per cent. How many words can he now type per hour?

3210

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3240

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3270

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3300

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Solution

The correct option is B 3240
Speed of the typist $= 45$ words\min
If his speed increase $20 %$ , then his speed $=$ $45 + \frac{20}{100} \times 45$
$\Rightarrow 45 + 9 = 54$ words\min
$∴$ Speed per hour $=$ $54 \times 60 = 3240$ words\hr

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