Mr. & Mrs. Bourrage's children all play different sports. They want to buy a
combination of track training sets, which each cost $150, basketball
training sets, which each cost $130, and cheerleading training sets, which
each cost $280. Let t represent the number of track sets, b represent the
number of basketball sets and c represent the number of cheerleading
sets. Which expression represents the total amount of money the
Bourrage's will spend based on the number of sports sets they buy?

150 + 130 + 280

150t + 130b + 280c

(150 + 130 + 280) (t + b + c)

t+b + c