Last year, laura had $30,000 to invest. she invested some of it in an account that paid 7% simple interest per year, and she invested the rest in an account that paid 8% simple interest per year. after one year, she received a total of $2230 in interest. how much did she invest in each account?

it would be 45%

Step-by-step explanation:

In order to find the number in between two numbers you need to calculate their mean. This can be done by adding them up then dividing by 2. In this case, 0.2+0.3 = 0.5. You can then divide this by 2 to give 0.25 
Thus the decimal in between 0.2 and 0.3 is 0.25.