Answer:
The answer is 18%
Step-by-step explanation:
Return on investment is defines as the revenue or profit that is earned by a business as a result of certain amount invested in a business or activity.
It is calculated by dividing profit realised by the amount invested.
The magazine subscription costs $45 a year, so for 3 years a subscriber pays 45*3= $135
However the amount he actually paid is $115 for the 3 years.
Gain in this transaction= 135- 115= $20
Return on investment= gain/amount invested
Return on investment= 20/115
Return on investment= 0.17391
Return on investment= 17.391%
This is closes to 18%