Question

Justin is selling cans of soda. It costs him $3 each week to advertise his business. He buys each can for $0.30 and sells each one for $1.00. Write an equation to model the amount of profit, P, Justin makes from selling x cans of soda in one week.
A. P = x − 3
B. P = 0.3x − 3
C. P = 3x + 0.7
D. P = 0.7x − 3

Answer 1

The answer is d because he buys them for .3 and sells them for 1 so 100-30=70=.7 and then it costs him 3 to advertise so you subtract three

Answer 2

The answer is D.

So if we are giving away 3$ a week that means we should have -3.

For each soda, we give 0.3$ and take 1$. That means we earn 0.7$ from each.

So we get 0.7 $ per soda and -3$ for advertisement.

Therefore, the equation is:  $P = 0.7x - 3$