The cost of erecting an office building is 50000 pesos for the first story, 52500 pesos for 2^nd story, 55pesos for the third story, and soon. Other expenses ( lot, plans, building permits, etc. ) are 350000 pesos. The net annual income is 5000 pesos per story. How many stories will give the greatest rate of interest on the investment?

a. 17 b. 14 c. 9 d. 21

The cost of erecting an office building is 50000 pesos for the first story, 52500 pesos for 2nd story, 55pesos for the third story, and soon. Other expenses (lot, plans, building permits, etc. ) are 350000 pesos. The net annual income is 5000 pesos per story. How many stories will give the greatest rate of interest on the investment? a. 17 b. 14 c. 9 d. 21