A village reservoir usually receives $1200\text{ mm}$ of rainfall annually. This year, due to a severe…
A village reservoir usually receives $1200\text{ mm}$ of rainfall annually. This year, due to a severe drought, it received $75\%$ less rainfall than normal. How much rainfall did the village receive this year?
$900\text{ mm}$
$300\text{ mm}$
$400\text{ mm}$
$150\text{ mm}$
Solution
A $75\%$ reduction means the village received only $25\%$ of its normal rainfall: $25\%$ of $1200\text{ mm} = 0.25 \times 1200 = 300\text{ mm}$.