There are two book shops own by Suresh and Ganesh. Their sales ( in Rupees) for books in three subject - Physics, Chemistry and Mathematics for two months, July and August 2017 are given by two matrices A and B. July sales ( in Rupees) :

Exercise 2.2 | Q 15.1 | Page 47

QUESTION

There are two book shops own by Suresh and Ganesh. Their sales ( in Rupees) for books in three subject - Physics, Chemistry and Mathematics for two months, July and August 2017 are given by two matrices A and B. July sales ( in Rupees) :
Physics Chemistry Mathematics
A = ${\displaystyle \left[\begin{array}{ccc}5600& 6750& 8500\\ 6650& 7055& 8905\end{array}\right]\left[\begin{array}{c}\text{Suresh}\\ \text{Ganesh}\end{array}\right]}$
August Sales (in Rupees :
B = ${\displaystyle \left[\begin{array}{ccc}6650& 7055& 8905\\ 7000& 7500& 10200\end{array}\right]\left[\begin{array}{c}\text{Suresh}\\ \text{Ganesh}\end{array}\right]}$
Find the increase in sales in Rupees from July to August 2017.

SOLUTION

Increase  sales rrupees from july to August 2017.
For Suresh :
Increase in sales for Physics books
= 6650 – 5600 = ₹ 1050
Increase in sales for  Chemistry books
= 7055 – 6750 = ₹ 305
Increase in sales for Mathematics books
= 8905 – 8500 = ₹ 405
For Ganesh :
Increase in sales for Physics books
= 7000 – 6650 = ₹ 350
Increase in sales for  Chemistry books
= 7500 – 7055 = ₹ 455
Increase in sales for Mathematics books
= 10200 – 8905 = ₹ 1295.