I'm trying to find the equivalent interest rate (gross of 40% tax) that a bank would have to pay to achieve a known future value return from a known present value amount over a know number of years. e.g. If I start with 80,000 and end up with 1,580,000 after 7 years, (and I pay tax of 40% on the interest I earn), what gross interest must the bank pay me to end up with 1,580,000?
Solved by G. E. in 12 mins