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mkvsirisha
how to solve this in lesser time

We are told that rates changes with sizes. The text gives us two examples which include both costs, one for a quantity between 100 and 500, useful to calculate then for 499, and the other for a size over 500, useful for 502.

As the rate seems to be costant for each quantity, we can calculate 217,30/200 (our rate) * 499 = 542,16
Same for the other, we calculate the costant rate for seize > 500 as it folows: 756,84/700 and then multiply it for 502 = 542,76
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                          Order         Final cost        After tax
­<= $100              $100         $109.18          $106      
$100 - $500         $200          $217.3           $212       
> $500                $700          $756.84         $742

For order >$100 and <=$500:
- Shipping rate: \(\frac{217.3}{212} = 1.025\) ==> 25%
- Final cost for an order of $499: 499 * 1.06 * 1.025 = 542.16

For order >$500
- Shipping rate: \(\frac{756.84}{742} =  1.02\) => 20%
- Final cost for an order of $502: 502 * 1.06 * 1.02 = 542.76


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