4. The number of shirts sold by the shopkeeper is given by the expression 2x-5. The price per shirt is given by the expression 3x+4 pesos. Find the total amount of revenue earned by the shopkeeper in selling the shirts.
a. 6x' +7x + 20 pesos
b. 6x²-7x + 20 pesos
c. 6x² +7x - 20 pesos
d. 6x²-7x - 20 pesos
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