Emily goes to the store to buy a jacket. The store is having a sale for 30% off the original price. Emily also has a $10 off coupon she will use to buy the jacket. The expression 0.7p -10 can be used to find her final price for a jacket with an original price of p dollars.

The jacket Emily decides to buy has an original price of $87.99. What is the final price of the jacket Emily is buying?