Question

Lake Chad in Africa had a surface area of about 10,000 square miles in 1963. Because of climate changes and increased water usage by humans, the surface area decreases to about 850 square miles in 2001. By what percent did the surface area change from 1963 to 2001?

Answer 1

Answer is 91.5%

Explanation:

In 1963= 10,000 sq miles; In 2001= 850 sq miles

• Now applying formula of percentage of decrease we get:

% = Decrease in Amount/ Actual Amount

• Applying values in formula:

= 10000-850/10000

= 9150/10000

% = 0.915

In percentage we get 91.5%