A spiral notebook costs $15, and a personal planner costs $10. How much would it cost in total to buy 4 spiral notebooks and 8 personal planners at a 20% discount?
If a spiral notebook cost $15, a 20% discount would reduce the price by 20/100 *15 = $
<gadget id="calculator">15*0.2</gadget>
<output>3</output>
3.
At a 20% discount, the buying price of a spiral notebook book is $15-$3= $
<gadget id="calculator">15-3</gadget>
<output>12</output>
12.
At the same discount, a personal planner cost would reduce by 20/100 * $10 = $
<gadget id="calculator">20/100*10</gadget>
<output>2</output>
2.
The new buying price of a personal planner will be $10-$2 =$
<gadget id="calculator">10-2</gadget>
<output>8</output>
8.
To buy four spiral notebooks at a 20% discount, you'll pay 4*$12 = $
<gadget id="calculator">4*12</gadget>
<output>48</output>
48.
At the same time discount, you'll buy eight personal planners at a cost pf 8*$8 = 
<gadget id="calculator">8*8</gadget>
<output>64</output>
64.
In total, to buy eight personal planners and four spiral notebooks, you'd have to pay $64+$48 = $112.

<result>112</result>