Marissa bought a set of scuba diving merchandise for RM x. The operating expenses incurred for the sale of those scuba diving merchandise are 12% of the cost. Marissa makes a 20% net profit based on retail price, she managed to sell it at RM12000. Therefore, for each of the scuba diving merchandise, find;

a) the value of x,

b) the total gross profit that Marissa has made,

c) the maximum trade discount that Marissa could offer without incurring loss, d) net loss or net profit when Marissa sells all her scuba diving merchandises at RM10000.