TW pp. 215-216
"When an attacker uses burst-fire weapons against conventional
infantry located in a building hex, treat such weapons
as direct-fire ballistic weapons, with their standard Damage
Values as noted on the appropriate Weapons and Equipment
Tables (see Attacking Units Inside Buildings, p. 171). Assign damage
as appropriate according to the Non-Infantry Weapon Damage
Against Infantry Table."
So, in this example, the infantry would take 1/10 = 0.1, for a minimum of 1 trooper.