Please solve it ASAP with all requirements please all

Calcule the ROI of your new company of cotton New Era caps "THUG LIFE CAPS" for the last Instagram ads Campaign, if you invested 100 euros per week in posts and 50 euros each 3 days in Instagram Stories, the champaign lasted 4 weeks (28 days).

You sold:

First Week 27 caps

Second Week 12 caps Third Week 8 caps Four week 0 caps

The price of each cap is 22 euros

Remember ROI Formula is:

ROI= (Benefit - Investment) / Investment

I you want to know the percentage: ROI X 100 = .... %

ACTIVITY 6

Define ROI.

Why do you think in Activity 5 the the sales went down over time?

Could you give an idea to keep the sales in the same line that the first week ?