Date | May 2021 | Marks available | 2 | Reference code | 21M.1.SL.TZ1.4 |
Level | Standard Level | Paper | Paper 1 | Time zone | Time zone 1 |
Command term | Find | Question number | 4 | Adapted from | N/A |
Question
The price of gas at Leon’s gas station is per litre. If a customer buys a minimum of litres, a discount of is applied.
This can be modelled by the following function, , which gives the total cost when buying a minimum of litres at Leon’s gas station.
where is the number of litres of gas that a customer buys.
Find the total cost of buying litres of gas at Leon’s gas station.
Find .
The price of gas at Erica’s gas station is per litre. A customer must buy a minimum of litres of gas. The total cost at Erica’s gas station is cheaper than Leon’s gas station when .
Find the minimum value of .
Markscheme
(M1)
A1
[2 marks]
(M1)
litres A1
[2 marks]
(A1)
(M1)
Note: Award M1 for a graph showing two intersecting linear functions, provided one function has a -intercept of and the other function has a negative -intercept.
(minimum value of ) A1
Note: Accept .
[3 marks]