Answer:
Courtney will pay $349.50 for the phone, which is $20.50 less than the original price. 
To calculate this, we first need to calculate the sale price of the phone with the coupon. 
The coupon is 5% 1 4, which is equivalent to a 20% discount. Therefore, the sale price of the phone is $370 - (20% x $370) = $296. 
The coupon gives an additional 5% 1 4 discount, which is equivalent to a 12.5% discount. 
Therefore, the final price of the phone is $296 - (12.5% x $296) = $349.