Multiple lookup adding columns, then multiplying, then lookup, add, and subtract

Need a formula to do the following in the attached file (Games.xlsx):
1. Look in COLUMN C for the entry "Deposit from games"
2. Total the amounts in COLUMN D that match the criteria in step 1
3. Multiply the total from step 2 by .7
4. Look in COLUMN F for the entry 70
5. Total the amounts in COLUMN G that match the criteria in step 4
6. Take the results from step 3 and subtract the results from step 5
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Steps 1&2 results = $6171.00
Step 3 results = $4319.70
Steps 4&5 results = $500
Step 6 results = $3819.70
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I have tried variations of sumproduct, sumif, and index match. I just can't figure it out. Formula will go in cell K3.