Answer and Explanation:
The computation is shown below
a.
For Additional revenue raised by State A:
Following calculations need to be done
Initial revenue = 5% × 800 million
= $40 million
Revenue from increased tax rate is
= 6% × $710 million
= $42.6 million
Now Additional Revenue raised by State A is
= $42.6 million - $40million
= $2,600,000
For Additional revenue raised by State Z :
Revenue from increased tax base is
= 5% × $50 million
= $2,500,000