Can someone please help me understand ?
Mathematics

Tutor: None Selected  Time limit: 1 Day 
(a) How much money do you take in if a family rents four rooms? (Round your answer to the nearest dollar.)
$
(b) Use a formula to give the rate you charge for each room if you rent n rooms to an organization.
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As described in the problem, for each extra room rented there will be $3 off the base price of 70$
(a) Now, when a family rents four rooms. That means they have rented 3 extra rooms.
$3 off for each extra room so discount for 3 extra rooms = 3 * 3$ = 9$
So price per each room is base price  discount i.e. 70$  9$ = 61$
Price for four rooms = 4 * 61$ = 244$
(b) Formula for computing rate you charge for one room when n rooms are rented is:
Rate per room = 70$  ( (n1) * 3$)
Above formula can be solved to get 73$  3n$
Above formula is derived using below logic
Rate per room = Base Price  (Number of extra rooms * 3$)
Note: In case you are asked to find out total price for n rooms, then you need to multiply price per room with n.
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