Answer:
12.5%
Explanation:
Actual measurement of the window = 24 inches
Measured measurement of the window = 27 inches
We need to find the Rivers percent error. It can be calculated as follows :
% = (|actual value-measured value|)/actual value × 100
![\%=(27-24)/(24)* 100\\\\\%=12.5\%](https://img.qammunity.org/2021/formulas/mathematics/high-school/g7jnimm34qwduil5hll7fdqwj8q7vgy6p7.png)
So, River's percent error is 12.5%.