A school team won 7 games this year and 5 games last year. What is the per cent increase in winning the games?

Given: No. of games won last year = 5

No. of games won this year = 7

Increase in no. of wins = 7 − 5 = 2

∴ Percentage increase in winning the games

$=\left(\frac{\mathrm{Increase} \mathrm{in} \mathrm{no}. \mathrm{of} \mathrm{wins}}{\mathrm{No}. \mathrm{of} \mathrm{games} \mathrm{won} \mathrm{last} \mathrm{year}}\right)\times 100$

$=\left(\frac{2}{5}\right)\times 100$

$=40\%$

Thus the percentage increase in winning the games this year is 40%.