Answer and Step-by-step explanation:
To estimate the total cost of 21 driving lessons, we can multiply the cost of a single lesson (£31.50) by the number of lessons (21).
Calculating the total cost:
£31.50 x 21 = £661.50
Therefore, the estimated total cost of the 21 driving lessons is £661.50.
Please note that this is an estimate based on the given information. The actual cost may vary depending on any additional fees or discounts that may apply.