If the selling price of a red pen, a blue pen and a black pen is Rs.20, Rs.15 and Rs.25 respectively, then find the total revenue generated by shopkeeper C by selling all the three types of pens.
For shopkeeper A, Let the number of red pens sold be ‘x’. Then, the number of blue pens sold = 55% of x = 0.55x Now according to question, => x + 0.55x = 310 => x = 200 Number of red pens sold = 200 Number of blue pens sold = 0.55x = 110 Number of black pens sold = 110 × (9/11) = 90 Similarly, we can find the required data for the other shopkeeper too. 
Total revenue generated by shopkeeper C = (100 × 20) + (120 × 15) + (168 × 25) => 2000 + 1800 + 4200 = Rs.8000
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