A Nation Had a Birth Rate of 20 in 1990 $\left( \frac { 20 - 13 } { 20 } \right) \times 100 = 35 \%$

Multiple Choice

A nation had a birth rate of 20 in 1990.The rate fell to 13 in 2000.What was the percentage change?

A) $\left( \frac { 20 - 13 } { 20 } \right) \times 100 = 35 \%$
B) $\left( \frac { 20 - 13 } { 13 } \right) \times 100 = 54 \%$
C) $\left( \frac { 13 - 20 } { 20 } \right) \times 100 = - 35 \%$
D) $\left( \frac { 13 - 20 } { 13 } \right) \times 100 = - 54 \%$