Question

In 1846 the depth of the river was 6.7 feet deep. In 1847 it dropped 9%. This year, 1848, it rose 7% What is the depth now.

Answer 1

6.5237 feet.

Explanation:

initial depth of river H = 6.7 ft

In 1847 it dropped 9%, this means the new depth will be 91% of 6.7

that is (91/100)×6.7 = 6.097 ft

Now in the year , 1848 the depth gain rose by 7%, this means now the new depth 107% of 6.097

= (107/100)×6.097 = 6.5237 feet.

Therefore, new of the depth of river in 1848 = 6.537 ft