Misc 7 - Chapter 3 Class 12 Matrices
Last updated at April 16, 2024 by Teachoo
Statement questions - Multiplication of matrices
Statement questions - Multiplication of matrices
Last updated at April 16, 2024 by Teachoo
Misc 7 (a) A manufacturer produces three products x, y, z which he sells in two markets. Annual sales are indicated below: Market Products I 10,000 2,000 18,000 II 6,000 20,000 8,000 (a) If unit sale prices of x, y and z are Rs 2.50, Rs 1.50 and Rs 1.00, respectively. Find the total revenue in each market with the help of matrix algebra. Let the sales of products x , y & z per market be denoted by matrix A A = [■8(10,000&2000&18,000@6,000&20,000&8,000)] Let the unit sale price of products x , y & z per market be denoted by matrix B Let B = [■8( 2.50 @[email protected])] Now, Total Revenue = Total sales × Unit sales price = AB = [■8(10,000&2000&18,000@6,000&20,000&8,000)]_(2×3) [■8([email protected]@1.00)]" " _(3×1) = [■8(10,000(2.50)+2000(1.50)+18,000(1)@6,000(2.50)+20,000(1.50)+8,000(1) )] = [■8(25,000+3,000+18,000@15,000+30,000+8,000)]= [■8(46,000@53,000)] Total Revenue = [■8(𝟒𝟔,𝟎𝟎𝟎@𝟓𝟑,𝟎𝟎𝟎)] Hence, Total revenue of Market I = Rs. 46,000 & Total revenue of Market II = Rs. 53,000 Note: We cannot do BA BA = [■8([email protected]@1.00)]" " _(3×1) [■8(10,000&2000&18,000@6,000&20,000&8,000)]_(2×3) Since, orders don’t match, BA is not possible Misc 7 (b) A manufacturer produces three products x, y, z which he sells in two markets. Annual sales are indicated below: Market Products I 10,000 2,000 18,000 II 6,000 20,000 8,000 (b) If the unit costs of the above three commodities are Rs 2.00, Rs 1.00 and 50 paise respectively. Find the gross profit. Let the unit cost price of products x , y & z per market be denoted by matrix C Let C = [■8( 2.00 @[email protected])] Now, Total Cost = Total sales × Unit cost price = AC = [■8(10,000&2000&18,000@6,000&20,000&8,000)]_(2×3) [■8([email protected]@0.50)]_(3×1) = [■8(10,000(2.00)+2000(1.00)+18,000(0.50)@6,000(2.00)+20,000(1.00)+8,000(0.50) )] = [■8(20,000+2,000+9,000@12,000+20,000+4,000)] = [■8(𝟑𝟏,𝟎𝟎𝟎@𝟑𝟔,𝟎𝟎𝟎)] Now, Profit = Revenue – Cost = [■8(46,000@53,000)] – [■8(31,000@36,000)] = [■8(𝟏𝟓,𝟎𝟎𝟎@𝟏𝟕,𝟎𝟎𝟎)] Thus, Profit = = [■8(15,000@17,000)] Hence, Total profit of Market I = Rs. 15,000 & Total profit of Market II = Rs. 17,000