You'll have to set this up as two separate problems. First, we want to take 15% off the original $20 bill. To do this, you're going to multiply 20 by .15, which gives you $3. So, 15% off $20 is $17.
Now, we want to find 7% of the new bill, so we're going to multiply 17 by .07 to get $1.19, and add it to the $17, making the final bill $18.19. You could also multiply $17 by 1.07 to get your final total without the extra step in the middle, but only do that once you're comfortable with the math.
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The correct answer is <span>{-5/2, 10/3}.</span>
Answer:
h(x) = x/2 + 5
Step-by-step explanation:
f(x) = 2x - 10
Step 1. Replace f(x) with y.
y = 2x - 10
Step 2. Switch variables x and y.
x = 2y - 10
Step 3. Solve for y.
2y - 10 = x
2y = x + 10
y = x/2 + 5
Step 4. Replace y with h(x)
h(x) = x/2 + 5
Answer:
The student must pay 4247.5 - 4000 = 247.50 dollars in interest
Step-by-step explanation: