Answer:
 700 square feet
Step-by-step explanation:
The total area of two units is 2×(840 ft²) = 1680 ft². Of that area, 980 ft² is allocated to kitchen and bath, so the remaining ...
 1680 -980 = 700 . . . square feet
will be the area of the two bedrooms. The area of each bedroom is half that amount.
350 square feet of carpet is needed for each bedroom.