A company handles an apartment building with 70
units. Experience has shown that if the rent for each of
the units is $540 per month, all the units will be filled,
but 1 unit will become vacant for each $10 increase
in the monthly rate. What rent should be charged to
maximize the total revenue from the building if the
upper limit on the rent is $650 per month?
A cable TV company has 4000 customers paying $55
each month. If each $1 reduction in price attracts 100
new customers, find the price that yields maximum
revenue. Find the maximum revenue.