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.
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40 % of 40 dollars = 40/100 * 40 = 0.4 * 40 = 16 dollars off 16 dollars off 40 dollars = 40 - 16 = 24 dollars
40% of 10,500,000 = 4,200,000 dollars
120 dollars.
2600 dollars
40/100*110=44 dollars