Multiple Regression Forecast

"Part C: asks what salary would you forecast for a man with 12 years of education, 10 months of experience, and 15 months with the company."

This is straight forward enough just reading off the coefficients table. $y=3526.4+(722.5)(1)+(90.02)(12)+(1.269)(10)+(23.406)(15)=5692.92$

but

"Part D: asks what salary would you forecast for men with 12 years of education, 10 months of experience, and 15 months with the company."

I know that the answer to this must be different from C, but I have no idea why, I would of just done exactly the same as in part C,

What is wrong with my train of thought or intuition and how might I go about calculating the salary for men, rather than a man?

"Part C: asks what salary would you forecast for a man with 12 years of education, 10 months of experience, and 15 months with the company."

This is straight forward enough just reading off the coefficients table. $y=3526.4+(722.5)(1)+(90.02)(12)+(1.269)(10)+(23.406)(15)=5692.92$

but

"Part D: asks what salary would you forecast for men with 12 years of education, 10 months of experience, and 15 months with the company."

I know that the answer to this must be different from C, but I have no idea why, I would of just done exactly the same as in part C,

What is wrong with my train of thought or intuition and how might I go about calculating the salary for men, rather than a man?