In the middle of the month, Miss Ong withdrew 5/6 of her money from the bank to buy a badminton racket and a bicycle. She spent $148 on the badminton racket and the remaining $412 on the bicycle. When she received her m0nthly salary at the end of the month, she saved 7/9 of it in the bank. As a result, the amount of money in her bank became $1400.
a) After the withdrawal, how much money had she left in the bank?
b) How much was Miss Ong’s monthly salary?