I am currently completing a Maths C assignment mainly focused on sequences and one of the questions asked us to algebraically solve how much money someone would accrue in a superannuation account with a 4.8% interest rate pa which is paid weekly and the person deposits $80 per week for 30 years. So far I have created an excel spreadsheet and used that to find the total amount but I'm not sure how to develop a formula involving the number of weeks. If anyone could help it would be much appreciated.