AHSME 1991 Problem 9

From time $t=0$ to time $t=1$ a population increased by $i\%$, and from time $t=1$ to time $t=2$ the population increased by $j\%$. Therefore, from time $t=0$ to time $t=2$ the population increased by $\text{(A) (i+j)\%} \text{(B) } ij\% \text{(C) } (i+ij)\% \text{(D) } \left(i+j+\frac{ij}{100}\right)\% \text{(E) } \left(i+j+\frac{i+j}{100}\right)\%$