Question 158236
.99+X*.07=5
.99+.07X=5
.07X=5-.99
.07X=4.01
X=4.01/.07
X=57.3 
57+20= 77 MINUTES IS THE MAXIMUM MINUTES SHE CAN USE FOR $5.00.
PROOF
.99+.07*57<5
.99+3.99<5
4.98<5