This question involves direct proportion which has the formula (y=kx) where y and x are the values which are proportional and k is the constant of proportionality.
The constant of proportionality is basically the value that stays the same even if the x and y values change.
In this case, the constant of proportionality would be 3/7.
Answer:
The answer is £ 496
Profit ( P) = Selling price (S) - Cost price ( C)
From the above question
Cost price = £3000
To find the selling price multiply the price of one ticket by the number of tickets sold
That's
Selling price = £18.50 × 189 = £3496
So now
Profit = £3496 - £3000 = £ 496
Hope this helps you