To quickly calculate this in your head, start by taking 10% of the value. This is done by simply moving the decimal place 1 to the left. In this example, 10% of $10.00 is $1.00. Now, we want 40% which is 4 times that amount (4 * 10% = 40%). So $1.00 * 4 = $4.00.
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10% = $40
you do 40*.25 and get 10. that means you have $10 off and the new total is $30
40% of $75 = $30 = 40% * $75 = 40%/100% * $75 = 300/10 = $30
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