The change in the price of an item is given, and you are asked to calculate this change as a percentage.

The difference in the price is 3 shekels out of 15 shekels. You have to calculate what percent of 15 is 3 .

Convert the question into a mathematical expression: $\frac{\mathrm{a}}{100} \cdot 15=3$. Solve the equation for a:

$a=\frac{3 \cdot 100}{15}=20$

Thus, the price dropped by $20 \%$.