Answer: a = 31
mov data, #16 ; stores 16 at addr 1
mov a, #7 ;stores 7 in accumulator
orl a, #8 ;7 or 8 = 15, stored in acc
mov r0, #1 ;stores 1 in register 0
add a, @r0 ; adds the value at address stored in r0 to acc. the address stored is 1 and have value 16, so a = 15+16 = 31
mov pcon, 2 ; does not affect a