3 a) Mo buys 20 chocolate bars for \( £ 8 \). He sells them all, making a \( 30 \% \) profit. How much does he sell each bar for?

Mo spends \( £ 8 \) for 20 chocolate bars, which means each bar costs him \( \frac{8}{20} = £ 0.40 \). With a \( 30\% \) profit, he sells each bar for \( 0.40 + (0.30 \times 0.40) = £ 0.40 + £ 0.12 = £ 0.52 \). Hence, he sells each bar for \( £ 0.52 \). To visualize this, think of the chocolate bars as tiny treasures. Mo not only buys them but also sells them for a sweet profit! That means crafting a price that feels just right for chocolate lovers while still ensuring he gets his chocolate money back—and a little extra for himself!