Tick (✓) the correct answer:
A period of 4 hours 30 min is what per cent of a day?
(a) $18 \frac{3}{4} %$
(b) 20%
(c) $16 \frac{2}{3} %$
(d) 19%

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Solution

(a) $18 \frac{3}{4} %$

$4 h 30 m i n = (4 \times 60 \times 60) + (30 \times 60)$
$= 16200 s e c$
$24 h = (24 \times 60 \times 60)$
$= 86400 s e c$
$Now, (\frac{16200}{86400} \times 100) % = 18 \frac{3}{4} %$

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