Jennifer’s best long jump distance increased by 10% from 1990 to 1991

Jennifer's best long jump distance increased by 10% from 1990 to 1991 and by 20% from 1991 to 1992. By what percent did her best long jump distance increase from 1990 to 1992 ?

1. 32%
2. 30%
3. 20%
4. 15%
5. 2%

Answer

The correct answer is A.

Let her distance in 1990 be d.

Her distance in 1991 would be 1.1d.

Her distance in 1992 would be 1.2(1.1d), which simplifies to 1.32d.

This represents an increase of 32% from 1990 to 1992.