A recipe for biscuits says Multiply the number of biscuits by 6.25 to find the number of grams of butter needed - OCR - GCSE Maths - Question 4 - 2023 - Paper 3

First, calculate the cost of driving an electric car for 12000 miles:

$$ext{Cost of electric car} = 12000 imes 0.68 = £816$$

Next, calculate the cost of driving a petrol car for the same distance:

$$ext{Cost of petrol car} = 12000 imes 0.77 = £924$$

Finally, to find out how much Charlie can save, subtract the cost of the electric car from the cost of the petrol car:

$$ext{Savings} = 924 - 816 = £108$$

Charlie can expect to save £108 next year.