Question

To calculate the total increase over the two years, you multiply the increases together:

(
1
+
0.15
)
×
(
1
+
0.18
)
=
1.15
×
1.18
=
1.357
(1+0.15)×(1+0.18)=1.15×1.18=1.357

So, there was a total increase of 35.7% over the two years.