Query related to homework from class 5

This is the followup of the question I asked earlier, Total sales should means here sum of product quantity multiplied by unit sales so in question 6 of homework, this should be the output [13 Nintendo Shooter 1/23/2020 12 ₹ 123,885.67470] & [15 Nintendo Shooter 1/25/2022 13 ₹ 105,242.33845]: (12 123885.67470) + (13 105242.33845) = 1,486,628.0964+1,368,150.39985 = 2854778.49625 not 123885.67470 + 105242.33845 = 229128.0132 (This is total unit sales for Nintendo & Shooter not total sales for Nintendo & Shooter ). Please help me out, Is there any points am I missing here.