18) The daily cost of operating a hospital, C is a linear function of the number of in-patients, and out- patients P, plus a fixed cost a, where C=a+bP+dl. Given the data in the table below, Days 1 2 3 Cost in RM, C 6956 6725 7100 No. of in-patients, I No. of out-patients, P 40 10 35 9 40 12 Write three linear equations to represent the data provided in the table. b. Find the values of a,b and d using Cramer's rule.