Jambmaths question:
The cost of kerosene per litre increases from N 60 to N 85. What is the percentage rate of increase
Option A:
42%
Option B:
41%
Option C:
40%
Option D:
25%
Jamb Maths Solution:
$\begin{align}
& change\text{ }in\text{ }price\text{ }=85-60=25 \\
& Percent\text{ }increment=\frac{change\text{ }in\text{ }price}{old\text{ }price}\times 100 \\
& Percent\text{ }increment=\frac{25}{60}\times 100=41.666666 \\
& Percent\text{ }increment\simeq 42percent \\
\end{align}$
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