What is difference between the number of Red apples sold by ‘P’ and ‘Q’ together and the number of Green apples sold by ‘R’ and ‘S’ together?

Total apples sold by ‘P’ = 1080/1.20 = 900 Green apples sold by ‘P’ = (900 – 100)/2 = 400 Red apples sold by ‘P’ = 900 – 400 = 500 Green apples sold by ‘Q’ = 3/2 × 400 = 600 Red apples sold by ‘Q’ = 1080 – 600 = 480 Red apples sold by ‘R’ = 0.80 × 480 = 384 Green apples sold by ‘R’ = 384/1.50 = 256 Total apples sold by ‘R’ = 256 + 384 = 640 Total apples sold by ‘S’ = 680 × 2 – 640 = 720 Green apples sold by ‘S’ = 5/12 × 720 = 300 Red apples sold by ‘S’ = 7/12 × 720 = 420 Number of Red apples sold by ‘P’ and ‘Q’ together = 500 + 480 = 980 Number of Green apples sold by ‘R’ and ‘S’ together = 256 + 300 = 556 Required difference = 980 – 556 = 424