Answer:
(4 x 0.1) x (3 x 0.1)
Step-by-step explanation:
if you first multiply 0.4 x 0.3, it gives 0.12, so then you will multiply all equations given and the answer is the equation that equals the same product as 0.4 x 0.3. the third one gave the answer 0.12 which is equal as the equation 0.4 x 0.3