Yes because the base is equal to top and doubles the distance which affects the inside area.
Hi,
Work:

Multiply both sides by 144.

Move X to left side and change its side.

Calculate the sum

Divide both sides by 80.

+++ Results +++
Fraction form:

Or decimal form:

Hope this helps.
r3t40
1,500×(((1+0.065)^(37)−1)
÷(0.065))=214,122.37
214,122.37−(214,122.37×0.10)
=192,710.13...answer