Posted by **lucy** on Tuesday, May 10, 2011 at 4:30pm.

What is the formula for finding these??

1. 30 % of 90

2. 70 is 10 % of what?

3. 4/10 of 30

4. change 2/8 to a percent

Please help me with these formulas! Thanks!

- math -
**Ms. Sue**, Tuesday, May 10, 2011 at 4:45pm
The word "of" means multiply.

Change the percent to a decimal.

30% * 90 = 0.3 * 90 = 27

0.1 x = 70

x = 70/0.1 = 700

I'll be glad to check your answers for the other problems.

- math -
**lucy**, Tuesday, May 10, 2011 at 5:08pm
so.. 3. 4/10 of 30=

4/10 x 30/1=12

and 4. 2/8 to % would be 8 into 2 which equals .25= 25 %

- math -
**Ms. Sue**, Tuesday, May 10, 2011 at 5:12pm
Both are right! :-)

## Answer this Question

## Related Questions

- Chemistry - 1.What is the formula for finding percent water hydrates? 2. And ...
- math - How do you solve percent of change? My problem says identify the percent ...
- Calc - I need help finding the correct formula after finding the doubling time ...
- Chemistry - I need some help with some of these questions: The action of ...
- Chemistry - I need some help with some of these questions: The action of ...
- chemistry - 1.to calculate the percent by massof an element in a known compound...
- math - what is x? x + 2 11/14 = 5 13/21 basically, i want to know the formula to...
- math - A bond has an average return of 6.8 percent and a standard deviation of 4...
- please help - In cell D21, type the formula to calculate the % change from ...
- chemistry - Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed ...