only answer D and E please. need asapp

A city plans to build underground drinking water storage tanks in its existing drinking water distribution system to save electricity use. A consulting firm has thoroughly analyzed the case and provided two plans for the city. For both plans, the tanks are cylindrical tanks, the numbers (integers) of tanks are greater than one but less than ten, and the expected total tank volume is the same. For individual water storage tanks, the initial costs (for the entire tanks) follow a power-sizing model with a power-sizing exponent (x) of 0.73. The interest rate (r) is 9.2%, compounded every other week. (A) What is the expected total tank volume (V)? (B) What is the diameter of each tank for Plan B (DB) ? (C) What is the initial cost for each cubic meter of tank volume for Plan B (IB) ? (D) What is the present worth of Plan A(PWA) ? (E) What is the present worth of Plan B (PWB) ? (F) Which plan should the city select