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t. (10 points) 4. The following table shows the estimated maintenance costs for the machines at one of the factories of Wright Industries Ltd. (a) If the rate of interest is 10%, how much should the firm set aside today to meet these expenses? BY = tuftterm x ( 1 - 15 / ( 1 - 0) Raw Year Materials($) 0 0 1 50,000 2 52,500 3 55,125 4 57,881.25 5 60,775.32 (compute the percentage at which costs are increasing each year) (b) What would the amount be if the rate of interest was 5%