Double lookup in multi column table

[maacmaac]

I have table of Sales reps and corresponding bonus structure for each person. Each rep is payed a bonus based on amount of sales. The bonus for reach Tier 1 is $5,000; the bonus for reaching Tier 2 is $50,000. The issue is each rep must achieve a different level of total sales to reach tier 1 and tier 2. I have attached a sample spreadsheet with actual sales for each rep and expected bonus for each. Thanks in advance for any comments.