#### 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 =

August Sales (in Rupees :

B =

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.

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.