How do i explain these math problems to someone?

Question

Hi! My sister and i were working on these problems, I have all the answers and now how to do it, but i just can't explain it in a way for her to understand.. plz help.

1. Write 49% as a decimal.

answer: .49

2. Change 73% to a fraction in lowest terms.

answer: 73/100

3. 17 is 4% of what number?

answer: 425

4. Jason answered 30 questions correctly out of 40. What percent of the problems did he work correctly?

answer: 75%

5. If you borrow $10,000 at 12%, how much will you have to pay back at the end of the year?

answer: $11,200

Answer 1

1. theres 100 places in the percent (like it goes to 100%) so add a decimal in the beginning....

2. 73 out of 100

idk about the rest lol. id have to work them out but im too tired

sorry if i didnt help much but thats how i see it, even though percentages can go over 100% SOMETIMES but im assuming she hasnt gotten there yet

Answer 2

1.  To change a percent to a decimal, divide by 100

2.  To change a percent to a fraction , put it over 100 and reduce if possible

3. When you see the percent , putit over 100

4/100 times 17/1 = ........425

4.   30/40 times 100 = .......75

5.    12/100  times  10000/1 =  1, 200  s0 you would have to pay back

the $10000.  plus the $1200. of interest. which equals $11,200