please help meeeeeee,

In June, the Wright family started saving for a trip to Florida.
The Wrights expect their vacation to cost $6500. They
deposit $1200 in June and their deposit grows by 15% each
month. How many months will it take the Wright family to
save for their trip?
a. 13 months
b. 10 months
c. 15 months
d. 11 months