Metal Products Company produces a sewing machine that sells for $300. An increase of 15% in cost of materials and of 10% in cost of labour is anticipated. If the only figures available are those given below, what must be the selling price to give the same percentage of gross profit as before? (a) Material costs have been 45% of cost of sales (6) Labour costs have been 40% of cost of sales (c) Overhead costs have been 15% of cost of sales. (d) The anticipated increased costs in relation to the present sales price would cause 35% decrease in the present gross profit