A photo measuring $20 \mathrm{~cm}$ by $25 \mathrm{~cm}$ is enlarged to make a photo measuring $25 \mathrm{~cm}$ by $30 \mathrm{~cm}$. The percentage increase in area is
(A) $250 \%$
(B) $50 \%$
(C) $80 \%$
(D) $37.5 \%$
(E) $25 \%$
The area of the original photo is $20 \times 25=500 \mathrm{~cm}^{2}$ and the area of the enlarged photo is $25 \times 30=750 \mathrm{~cm}^{2}$. The percentage increase in area is $\frac{\text { Final Area }- \text { Initial Area }}{\text { Initial Area }} \times 100 \%=\frac{750-500}{500} \times 100 \%=\frac{250}{500} \times 100 \%=50 \%$