Coors Field 117 BA 139 & 139 for HR's.

Thats Coors last year. Lets make life easy and use 120 BA and 140 HR's.

Player 1
.400 hitter, 200 hits, 500 atbats, 40HR's.

120 affects hitter half the time, thus overall average would be 110, HR's at half the time would be 120

200 hits divided by 1.1(for the 110) = 181.82 hits thus .364 average.

40 HR's divided by 1.2(for the 120) = 33.33 HR's

Thus Player 1 is actually
.364 hitter, 181.82 hits, 33.33 HR's