The total expenditure of a family, on different activities in a month, is shown in the pie-chart. The extra money spent on education as compared to transport (in percent) is  ______.

1. $5$
2. $33.3$
3. $50$
4. $100$

The expenditure of a family, on education $= 15\%,$ on transport $= 10\%.$

The extra money spent on education as compared to transport $= \left(\dfrac{15-10}{10} \right) \times 100\% = 50\%.$

So, the correct answer is $(C).$
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