Answer:
The state of New York should offer bonds at 4.76% to make indifference to purchase their bonds than Surething Inc.
Explanation:
the corporation has to pay income taxes while the State of New York do not pay for income taxes thus his yield is after-tax.
Surething Inc after tax rate:
pre-tax x (1 - tax-rate) =6.8% x ( 1 - 30%) = 0.068 x (1-0.30) = 0.0476 = 4.76%
Currently the corporation bond yield a higher rate than the State of New york (4.76% against 4.10%)