PLS HELP ME Find which step that adam made an error. if there are no errors say so!

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?

What is the score range for the smallest percent of students

Ihave a im dumb veryyy dumb! so maybe you can me with my math? pretty < 3