Each month, barry makes three transactions in his checking account
• he deposits $700 from his paycheck
• he withdraws $150 to buy gas for his car
• he withdraws $400 for other expenses
if his account balance is $1,900 at the end of the 1st month, which recursive equation models barry's account balance at the end of month n?
a f(1) = 1,900; f(n) = 150 · (n − 1), for + > 2
b. f(1) = 1,900; f(n) = y(n-1) + 700, forn > 2
c. f(1) = 1,900; f(n) = f(n - 1) + 150, forn 2
d. (1) = 1,900; f(n) = f(n-1) - 150, for ^ > 2