See https://web2.0calc.com/questions/need-help-now_10.
I have included a picture. In the picture you will find the work and final answer.
Simple interest= prt
=806.68 (.0525)(1)
=42.35
Balance=investment + interest earned
806.68+42.35=$849.03
More context? please? ..........
Set= 2 pillows + quilt
Set= (2×0.75)+12
Set= 13.5
3 sets= 3×13.5
3 sets=40. 5