Helolo, dragonation!

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 orderover 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:

. .

Therefore: .