a) $$5\frac{1}{2}\% $$
b) $$3\frac{1}{2}\% $$
c) 3%
d) $$4\frac{4}{5}\% $$
Answer: d
Explanation:
$$\eqalign{
& {\text{Quantity of salt in 6L of sea water,}} \cr
& = \frac{{ {6 \times 4} }}{{100}} = 0.24 \cr
& {\text{Percentage of salt in 5L of sea water,}} \cr
& = \frac{{ {0.24 \times 100} }}{5} = 4\frac{4}{5}\% \cr} $$
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