Next year the Chennai school's total spending shown in the chart rises by 10%, and its salary bill rises to…

Explanation

1. 01

   New total: $80{,}00{,}000 \times 1.1 = 88{,}00{,}000$.

2. 02

   Salary share: $\frac{52{,}80{,}000}{88{,}00{,}000} \times 100 = 60\%$.