Need help on economics please!

For floors 3 through 5

A real-estate developer seeks to determine the most economical height for a new office building, which will be sold after five years. The relevant net annual revenues and salvage values on after-tax basis are as given in the table below. The developer is uncertain about the interest rate (i) to use, but is certain that it is in the range from 5% to 30%. For each building height find the range of values of i for which that building height is the most economical. Find the range of values of i for which the 2 floors height is the most economical. Select the correct choice below and, if necessary, fill in the the answer box(es) to complete your answer. The 2 floors height is the if the interest rate is between 20 % and 30 %. (Round to the nearest whole number. Enter values in ascending order.) The 2 floors height is never the most economical option. Find the range of values of i for which the 3 floors height is the most economical. Select the correct choice below and, if necessary, fill in the the answer box(es) to complete your answer. Select the correct choice below and fill in the the answer box(es) to complete your answer, if necessary. The 3 floors height is the most economical if the interest rate is between % and %. (Round to the nearest whole number. Enter values in ascending order.) The 3 floors height is never the most economical option