A businessman bought a used building and found a used building and found that the roof insulation was insufficient. He estimated that 6 inches of insulating foam could cut heating bills by $25 per month and air conditioning costs by $20 per month. Assuming that the first six months of the year are winter and the next six are summer, how much can you afford to spend on insulation if you expect to only have the building for two years? suppose i=1 1/2% per month