At a reastaurant, Toby knew he would tip his server 20% of whatever the cost(c) of the final bill was. He knew he could use the strategy "c + 0.2c" to calculate his final cost after paying the 20% tip. Which other process could Toby use to calculate his cost after tip?
Toby could use the process of multiplying the cost by 1.2 to calculate his cost after tip. This is because adding 0.2c to c is the same as multiplying c by 1.2. Therefore, Toby could use either "c + 0.2c" or "1.2c" to calculate his cost after the 20% tip.
