Question

In 1846 the depth of the river was 5 feet deep.

In 1847 it dropped to 4.3 feet.

This year, 1848, it rose to 6.1 feet.

Find the percent change in river depth & complete the table.

Answer 1

First, 5 to 4.3 feet, to make it a bit easier, let’s multiply by 2, now we have 10 and 8.6. Since 8.6 - 10 = -1.4, the river dropped 14% in 1846-1847.

Second, we will find the change from 4.3 to 6, and 6 - 4.3 = 1.7, but we need to multiply it by 1.66…7, which approximately equals a 28.32% gain.

Explanation: