Hi there! :)
<u>Answer:</u>
20% of the money she saved last year was saved during the month of January.
Step-by-step explanation:
Marie saved $3,000 last year.
She saved $600 in the month of January.
SO, Marie saved: ![\frac{600}{3,000}](https://tex.z-dn.net/?f=%5Cfrac%7B600%7D%7B3%2C000%7D)
In order to answer your question, you'll need to use the cross product method (because you want to have a percentage, which is on 100 and not on 3,000 like we have right now):
![\frac{600}{3,000} = \frac{x}{100}](https://tex.z-dn.net/?f=%5Cfrac%7B600%7D%7B3%2C000%7D%20%3D%20%5Cfrac%7Bx%7D%7B100%7D)
<u>(100 × 600)</u> ÷ 3,000 = x
<u>60,000 ÷ 3,000</u> = x
<u>20 = x</u>
There you go! I really hope this helped, if there's anything just let me know! :)