Answer:
see explantion
Explanation:
The selling price is $495. 
 
The first washing machine: 
 
- is marked down by 30% 
 
$495 - 100% 
 
$x - 100% - 30% = 70% 
 
Find the value of x: 
 
 
 
The second washing machine: 
 
- is marked down by 20% with an additional 10% off 
 
$495 - 100% 
 
$y - 100% - 20% = 80% 
 
Find y: 
 
 
 
Now, 
 
$396 - 100% 
 
$z - 100% - 10% = 90% 
 
Find z: 
 
 
 
Thus, the sale price of the first washing machine is $347 and the sale price of the second washing machine is $356. The second machine is more expensive.