6.80
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340 is 40% of 850, so 850 minus 340 = 510. If 10% = $85 then 40% = $85 x 4. Take this amount from your total and you have you answer.
There are two potential answers to that. 20 minus the value 10% is 19.90. 20 minus 10 percent of 20 is 18.
80
96
100