Answer:
119
Step-by-step explanation:
Commission = Sale amount × Commission percentage
C = 3,400 * 3.50
C = 11900
Move decimal 2 places to the left
C = 119
Write the equations:

Substitute for h:

Solve for s:

There were 280 downloads of the standard version. There were 1120 downloads of the high-quality version.
The answer to 60 x 0.75 is 45