Please help me .. Please help please please please

1. Khalil buys a car using a new instalment scheme. He has to pay RM450 at the end of the first month, RM452 at the end of the second month and RM454 at the end of the third month and so on for 9 years. Find: a) the 15th payment. b) the month that Khalil has to pay RM500. c) the final payment. d) the total amount that Khalil has to pay. 2. Muthu saved RM100 in February, RM110 in March, RM121 in April and so on until September. Find: a) the amount that Muthu saved in August. b) the total amount that Muthu saved from February to September