Step 1: Total Fertilizer-Q = 3150 / 0.21 = 15000 Kg, so company E's Fertilizer-Q sale = 17% of 15000 = 2550 Kg.
Step 2: Total Fertilizer-P = 2520 / 0.21 = 12000 Kg, so company A and B together on Fertilizer-P = (15 + 22)% of 12000 = 37% of 12000 = 4440 Kg.
Step 3: Required percent = (2550 / 4440) x 100 = 57.43, closest to 57.40.