Final answer:
The cost to buy a family ticket for the theme park online, after a 15% discount, is 57.8 pounds. This is found by calculating 15% of 68 pounds and subtracting it from the original price.
Step-by-step explanation:
A family ticket for the theme park originally costs 68 pounds. When purchased online, there is a 15% discount. To calculate the discounted price, you first need to find out what 15% of 68 pounds is:
15% of 68 = (15/100) × 68 = 0.15 × 68 = 10.2 pounds
This means the discount is 10.2 pounds.
Next, subtract this amount from the original price to find the discounted price:
68 - 10.2 = 57.8 pounds
So, the cost to buy a family ticket online for the theme park is 57.8 pounds.