A rental car is driven d miles per day. The cost c is _ 2200 + 100' (3 cents per mile. (3) Find the cost per mile for a 100-mileper-day trip. n cents per mile (b) How many miles must be driven per day to bring the cost down to 21 cents or less per mile? E miles (c) Rewrite the formula for c to make it clear that :1 decreases as 0' increases. c = d What is the limiting value of c as 0' gets very large? n cents per mile