exam Maths Puzzle Numerical Ability

Please help I have no idea how to do this!

The difference between the selling price and the variable cost per unit for a given product is
called the contribution to profit for

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exam Other Question

a reduction of 20%in the price of sugar enables Mr shah to buy an extra 5kg of it for rs 320.find

1)original rate

2)the reduced price per kg complete the table of value.graph and name the point of intersection.THanks for the help.I appreciate it.

y=3x-7

x y
-2 ?
-1 ?
0