There were 45 soccer balls, 30 basketballs and 68 ping pong balls in the PE room. After 80 balls were added, the number of soccer balls increased by 40% and the number of ping pong balls increased by 25%. What was the percentage increase in the number of basketballs? Ans: ___

1. Calculate the number of soccer balls added.

Increase in soccer balls = $40\% \times 45 = \frac{40}{100} \times 45 = 18$

2. Calculate the number of ping pong balls added.

Increase in ping pong balls = $25\% \times 68 = \frac{25}{100} \times 68 = 17$

3. Calculate the number of basketballs added.

Increase in basketballs = $80 - 18 - 17 = 45$

4. Calculate the percentage increase in the number of basketballs.

Percentage increase = $\frac{45}{30} \times 100\% = 1.5 \times 100\% = 150\%$