Two sisters, Lily and Suri, have been saving money for college for the past several years. At the end of the first year, each sibling had $20. At the end of every year after
that, Lily managed to triple the total amount from the previous year, while Suri increased the total amount from the previous year by $80.
If the trend continues, how many years will it take Lily to have more money saved than Suri?
