Answer:
c
Step-by-step explanation:

Answer:
18/4
Step-by-step explanation:
Subtract to find the amount of tax paid:
1890 - 1800 = 90
Divide the amount of tax by the price of the computer:
90 / 1800 = 0.05
Multiply the decimal by 100:
0.05 x 100 = 5%
The tax rate is 5%
Do you have a specific equation I can help you with. I can explain them better with a problem to look at?
Answer:
b
Step-by-step explanation:
you can break the 78 into 70 and 8, and multiply them separately by 6 and then add the two answers to get 468