Answer:
New Cost of item is
![\$ 21](https://img.qammunity.org/2020/formulas/mathematics/middle-school/rgryjtbeb7i5m5qnbjqyy4eup3vebgseuq.png)
Explanation:
Given:
Original Cost of item =
![\$ 42](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4tyv289fq4hx4f01litb4qmz1zqu9aolyy.png)
Item was marked down by
![50\%](https://img.qammunity.org/2020/formulas/mathematics/high-school/yr4lfk7r0iri9gwoytxbryx8gsa9kd0etr.png)
To Calculate Cost after
marked down we need to multiply original cost by 50 and then divide by hundred.
Cost after marked down =
![(42 * 50)/(100)= \$21](https://img.qammunity.org/2020/formulas/mathematics/middle-school/wc9snd1zpgx750570mdrdpn4juxpmif6pg.png)
Now New cost of the item is calculated by Subtracting Cost after
marked down by Original Cost of item.
New cost of the item =
![\$ 42 - \$ 21 = \$21](https://img.qammunity.org/2020/formulas/mathematics/middle-school/fhsb589mra29j49v45rkk4c6080et5n2d5.png)