Answer with explanation:
You first have to find 10% of $200. To do this, you have to multiply the decimal form of 10% with 200.
So,
10% of 200
0.1 of 200
0.1 × 200 = 20
Now since the 10% acts as a discount, you subtract the 10% of 200 from $200.
$200 - 20 = $180
So the new price of the phone is $180.