Question

Suppose three people ate a meal in a restaurant. The cost of each of their meals is m. One person intends to tip 10%, the second person intends to tip 15%, and the third person intends to tip 20%. Which expression represents the total amount that they'll pay?
A. 1.1m + 1.15m + 1.2m
B. 0.1m + 0.15m + 0.2m
C. 1.1m + 2.15m + 3.2m
D. 1 + 0.1m + 1 + 0.15m + 1 + 0.2m

Answer 1

Your answer would be D

Answer 2

For this case we have:

m represents the total cost of each meal. If people do not pay a tip, the total cost to pay would be:

$m + m + m = 3m$

Person 1:

Without tip the cost of your meal is m.

You want to pay 10% tip

m -------------------> 100%

x --------------------> 10%

$x =\frac{(10)(m)}{100} = 0.1m$

Thus, its cost will be:

$C1 = m + 0.1m = 1.1m$

Person 2:

Without tip the cost of your meal is m.

m -------------------> 100%

x --------------------> 15%

$x =\frac{(15)(m)}{100} = 0.15m$

Thus, its cost will be:

$C2 = m + 0.15m = 1.15m$

Person 3:

Without tip the cost of your meal is m.

m -------------------> 100%

x --------------------> 20%

$x =\frac{(20)(m)}{100} = 0.20m$

Thus, its cost will be:

$C3 = m + 0.20m = 1.20m$

Thus, the total cost to pay will be:

$C = 1.1m + 1.15m + 1.20m$

Answer:

$C = 1.1m + 1.15m + 1.20m$