Posted by **aelisha** on Friday, October 3, 2008 at 9:28pm.

For groups of 80 or more people, a charter bus company determines the rate per person according to the formula:

Rate=8-0.05(n-80),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'.

- pre-calculus -
**Reiny**, Friday, October 3, 2008 at 9:40pm
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

- pre-calculus -
**aelisha**, Friday, October 3, 2008 at 10:41pm
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.(12-0.05n)n

3.12n+4

4.none of these

5.80n

6.8n-4

thanx so much

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