Answer:
$ 150
Step-by-step explanation:
Given:
Cost price of a microwave = $105
Discount % = 30
Question asked:
what was the price of the microwave before sale = ?
Solution:
Let the price of the microwave before sale = 
Price before sale - 30 % discount = cost price of microwave (by Javier)



Multiplying both side by 100


Dividing both side by 70

x = price of the microwave before sale = $ 150
Thus, price of the microwave before the sale = $150