Final answer:
To calculate the total cost of a gym membership with a discount based on the number of friends signed up, determine the initial cost and apply the discount for each friend. The options A, B, C, and D represent different percentages of discount per friend.
Step-by-step explanation:
To calculate the total cost of a gym membership with a discount based on the number of friends signed up, you need to determine the initial cost and then apply the discount for each friend. Let's assume the initial cost is $100.
A) The cost is reduced by 10% per friend signed up:
If you sign up 1 friend, the cost will be reduced by 10% of $100, which is $10. So the new cost will be $100 - $10 = $90.
If you sign up 2 friends, the cost will be reduced by 10% of $90, which is $9. So the new cost will be $90 - $9 = $81.
B) The cost is reduced by 15% per friend signed up:
If you sign up 1 friend, the cost will be reduced by 15% of $100, which is $15. So the new cost will be $100 - $15 = $85.
If you sign up 2 friends, the cost will be reduced by 15% of $85, which is $12.75. So the new cost will be $85 - $12.75 = $72.25.
C) The cost is reduced by 20% per friend signed up:
If you sign up 1 friend, the cost will be reduced by 20% of $100, which is $20. So the new cost will be $100 - $20 = $80.
If you sign up 2 friends, the cost will be reduced by 20% of $80, which is $16. So the new cost will be $80 - $16 = $64.
D) The cost is reduced by 25% per friend signed up:
If you sign up 1 friend, the cost will be reduced by 25% of $100, which is $25. So the new cost will be $100 - $25 = $75.
If you sign up 2 friends, the cost will be reduced by 25% of $75, which is $18.75. So the new cost will be $75 - $18.75 = $56.25.