Question

In 1846 the depth of the river was 5 feet deep. In 1847 it dropped to 3.5 feet. This year, 1848, it rose to 5.3 feet.

What is the percentage change

Answer 1

From 1846 to 1847 there was a 30% decrease and from 1847 to 1848 it increased by 51.4%

Explanation:

How it decreased by 30%

V2-V1/V1x100

V2=3.5 V1=5

=(3.5−5)|5|×100
=−1.55×100

=−0.3×100

=−30%change

=30%decrease
How it increased by 51.4%
V2-V1/V1x100
V2=5.3 V1=3.5

=(5.3−3.5)|3.5|×100

=1.83.5×100

=0.514286×100

=51.4286%change

=51.4%increase