Price increase in September: 165%
Current price: $62.80
To calculate the cost of a cell phone in September 2015, we have to multiply the current price ($62.80) by the price increase percentage in decimal form ( divided by 100).
Mathematically speaking:
62.80 x (165/100=
62.80 x 1.65 = $103.62
The predicate cost of a cell phone in September 2015 is $103.62