Answer:
424
Step-by-step explanation:
You want the weighted average of 420 and 430, using weights 4 and 3.
The weighted average is found by multiplying each value by its weight, adding the products, then dividing that sum by the sum of the weights.
[tex]\text{forecast}=\dfrac{420\cdot4+430\cdot3}{4+3}=\dfrac{1680+1290}{7}\\\\\boxed{\text{forecast}\approx424}[/tex]