Answer: 10 years to call
Explanation:
Maturity period = 25 years
Coupon rate = 7%
6.25% basis is,
This bond is considered as premium bond. Therefore, in case of premium bonds, Yield to call will be lower than the yield to maturity. Here, the question is which call date should be utilized. According to the rule of thumb, it states that always use the term that is nearest to the whole call date.
Hence, on the customer's confirmation, the dollar price quoted must be based on 10 years to call.