A phone company charges 10 cents per minute for the first 3 minutes of a call and 10-c cents for each minute thereafter. What is the cost, in cents of a 10-minute phone call?

Question

anonymous · Answer

Is this question right? As written, the charges are always 10 cents per minute.

More likely, it is 10 cents for first three minutes and ten cents per minute after that:

c = 10 for x<= 3
c = 10 + 10(x-3) for x>3

anonymous · Answer

sorry that isnt a answer choice! 
The answer choices are 
a) 200-20c 
b) 100c+70
c) 30+7c
d) 100-7c
e) 100-70c

anonymous · Answer

I think the question is mistaken in some way. Ten minute will cost 30 plus something.  so answer is probably C from 30 +(x-3)10c for x minutes.