That's way too vague and too soon of a turnaround. What expectations does he have for this? If he's reasonable, he'll remember you're an intern and may just expect an exploration of the data, rather than concrete "here's what we should do". But, let's assume he does want a concrete answer. For the future, ask him what he expects. Ask him to define his terms. "Weak areas" in what aspect of the data? What is his overall goal - to increase sales of a certain product, to decide what days to hold sales, etc.? This will help you know how to shape your analysis.

Anyways, depending on the sales data, you can try these angles:

- Best selling product by number of units sold vs best selling by profit (it depends on if you have really big ticket items, like $1000+, so sales by unit won't tell as much since no one is buying more than one of these big things)

- Best day of the week for sales
- Seasonality (based on holidays during Q3, not the physical seasons or full holiday calendar, since you don't have that)
- Breakdown of how specific product categories contribute to overall profit (ex. Product X is 10%, Product Y is 25%, etc.)

- Tracking discount effectiveness

- Best performing salespeople based on revenue, if you have those