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A sales man is paid a basic salary of sh 4 500 and a house allowance of sh 1 800 per month. On top of this he is paid commission at the rate of 5% on the first sh 10 000 worth of goods sold and further commission of #7 1/2%# on anything above this. At the end of the first month he received a gross income of sh 7 595 while at the end
of the second month he received a commission of sh 1 445. Determine the difference in the value of goods sold during the two months.