Tax is what you pay at the end of your transactions and discounts is the percentage of what you get off your purchase. both tax and discounts both effect the price of your purchase.
Answer:
9000rs.
Step-by-step explanation:
No. Of math book teacher bought =45
No of english books teacher bought =45
Cost of English books -105rs.
Cost of math books -95rs
Teacher paid-45 x 105+42×95
-45x (105 + 95)
-200
-9000 rs.
The answer is the first one or -10