76. a,b and c are correct
and d is incorrect
because...
d=2.83
78. raelene earns= $600pw =$2400 per month
naomi=$550pw=$2200 per month
danny = more than naomi and less than raelene
therefore any thing more than $2200 and less than $2400 could be danny's possible earnings per month
so a and b are...