A good costs a basic $180 a unit, but if an order is made for more than 10 units,
this price is reduced by a discount of $2 for every unit increase in the size of an order.
That is, if the order size is 11, price is $178; if it is 12, price is $176, etc.
Write an expression for the total cost of an order in terms of order size and simplify it.
Assume order size is between 10 and 60 units.
Let = number of units in the order over 10.
The number of units in the order is: .
For each , there is a $2 disccount on the unit price.
That is, for each over 10, the price is reduced by dollars.
For units, the unit price is: . dollars.
The cost of units at dollars each is: