Question 1173501
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The 20% price reduction multiplies the cost by a factor of (100%-20%=80%), or 0.8.<br>
The 15% added tax multiplies the cost by a factor of (100%+15%=115%), or 1.15.<br>
The price with taxes is going to be the original price, multiplied by those two factors:<br>
{{{325(0.8)(1.15) = 299}}}<br>
Setting aside $30 a week for the purchase, the number of weeks required will be 299/30 = 9.97.  The answer must of course be rounded up to the next whole number, so 10 weeks.<br>