We will have at first the 30% of the regular price to find the selling price
Since the regular price = $400
Then 30% of 400 is
![(30)/(100)*400=120](https://img.qammunity.org/2023/formulas/mathematics/high-school/dp6f0pwhtvbddxhbs5ehehz7itpati44v6.png)
Subtract it from $400 to find the selling price
The selling price = 400 - 120 = $280
Now we will find 10% of $280 to get the final price
Since 10% of 280 is
![(10)/(100)*280=28](https://img.qammunity.org/2023/formulas/mathematics/high-school/th2pwck57pg3ng74m01dyt11f8q15sx4sy.png)
Subtract it from 280 to get the final price
The final price = 280 - 28 = $252
She can buy it for $252
The answer is D