Answer:
Part A) The correct Expression : (1.05)(190)(0.8)
=> The error of Joel was that instead of adding the sales tax, he subtracted it.
Part B) $159.60
Step-by-step explanation:
<u><em>Part A:</em></u>
To calculate the computer cost, we need to find out the selling price first.
There's a discount of 20% so the selling price will be 100% - 20% = 80% =>80/100 = 0.8
<em>So, We'll multiply the cost price by 0.8</em>
=> (190)(0.8)
But, there is a sales tax of 5%
<u><em>So, the selling price with cost price will be:</em></u>
=> 100% + 5% = 105% => 105/100 = 1.05 (We'll multiply this too with the first equation that we made above)
So, the expression will be:
=> (1.05)(190)(0.8)
The error of Joel was that instead of adding the sales tax, he subtracted it.
<u><em>Part B)</em></u>
<u><em>Joel will pay for the tablet:</em></u>
=> (1.05)(190)(0.8) [We used the above expression]
=> $159.60
