Case study Chapter 3 (Matrix )
Case study 3:- Read the following and answer the question:(Case study problem matrix 3)
Three schools DPS, CVC and KVS decided to organize a fair for collecting money for helping the flood victims. They sold Handmade fans, Mats and plates from recycled material at a cost of ₹25, ₹ 100 and ₹50 each respectively. The number of articles sold are given as.

School/article |
DPS | CVC | KVS |
Handmade fans |
40 | 25 | 35 |
Mats |
50 | 40 |
50 |
Plates |
20 | 30 |
40 |
(i) What is the total money (in ₹) collected by the school DPS ?
(a) 700 (b) 7,000
(c) 6,125 (d) 7,875
(ii) What is the total amount of money (in Rs) collected by schools CVC and KVS ?
(a) Rs 14000 (b) Rs 15,725
(c) Rs 21,000 (d) Rs 13,125
(iii) What is the total amount of money collected by all three schools DPS, CVC and KVS ?
(a) Rs 15,775 (b) Rs 14,000
(c) Rs 21,000 (d) Rs 17,125
(iv) If the number of Handmade fans and Plates are interchanged for all the schools, then what is the total money collected by all school ?
(a) Rs18,000 (b) Rs 6,7520
(c) Rs 5,000 (d) Rs 21,250
(v) How many articles (in Total) are sold by three schools ?
(a) 230 (b) 130
(c) 430 (d) 330
Solution:(i) Answer (b)
Total money (Rs) collected by the school DPS
= 40×25 + 50×100 + 20×50
= 1000 + 5000 + 1000
= Rs 7,000
(ii) Answer (a)
Total amount of money collected by CVC and KVS
Total amount of money collected by CVC and KVS
= 6,125 + 7,875
= Rs 14,000
(iii) Answer (c)
Total amount of money collected by all three schools
= 7,000 + 6,125 + 7,875
= Rs 21,000
(iv) Answer (d)
After interchanging the number of Handmade fans and Plates,
We have
School/article |
DPS | CVC | KVS |
Handmade fans |
20 | 30 | 40 |
Mats |
50 | 40 |
50 |
Plates |
40 | 25 |
35 |
Amount of collected by all schools
∴ Total money = 75,00 + 6,000 + 7,750
= Rs 21,250
(v) Answer (d)
Total number of articles sold by three schools
= ( 40 + 25 + 35) + (50 +40 + 50) + (20 + 30 + 40)
= 100 + 140 + 90 = 330
Case study 1:- Read the following and answer the question(Case study problem matrix 1)
A manufacturer produces three stationery products Pencil, Eraser and Sharpner which he sells in two markets. Annual sales are indicated below

Solution: For solution click here
Case study 2:- Amit, Biraj and chirag were giventhe task of creating a square matrix of order 2. Below are the matrices created by them. A, B, C are the matrices created by Amit, Biraj and Chirag respectively.(Case study problem matrix 2)

Solution: For solution click here


