precalculus
posted by aelisha on .
For groups of 80 or more people, a charter bus company determines the rate per person according to the formula:
Rate=80.05(n80),n(greater than or equal to)80
where the rate is given in dollars and 'n' is the number of people.
Now, Express the revenue 'R' for the bus company as a function of 'n'.

Your equation already expresses the revenue R as a function of n
Did you want to express n as a function of R ?
If so, expand it first, then solve for n
R = 8  .05n + 4
R = 12  .05n , this is the simplest R expressed as a function of n
.5n = 12  R
n = (12  R)/.05 
well the problem does say express the revenue for the bus company as a function of n.
maybe this will help:
here are the answer choices:
1.(4+0.05n)n
2.(120.05n)n
3.12n+4
4.none of these
5.80n
6.8n4
thanx so much 
You'd have saved yourself and Reiny a lot of time if you'd posted the answer choices in your original message. You also may have gotten a more explicit answer if you'd posted your thoughts on this answer.

well i didn't want to post the answers because someone could easily choose an answer choice. i just wanted to compare reiny's answer to the answer i'd already gotten. i wanted to double check from a credible source.

Revenue = (240nn^2)/20
n is greater than or equal to 80