Answer:
$9.60
Explanation:
Find the Discount 
The sale is 85% off, and the chalkboard is $64. To find the discount, multiply 85% and 64 
85%*64
Convert 85% to a decimal by dividing by 100, or moving the decimal 2 spots to the left 
85/100=0.85
85. --> 8.5--> .85 
0.85*64=54.4
$54.40 is the discount 
Find the price 
Now we now the discount is $54.40. We have to subtract the discount from the regular price to find the sale price 
regular price - discount 
64-54.40
9.6 
$9.60 is the sale price