Answer :

19 × 3.6 =68.4
and 
2.87 + 3.5 =6.37
Therefore,68.4-6.37=62.03
product of 19 and 3.6 = 19 X 3.6 = 68.4
 sum of 2.87 and 3.5 = 2.87 + 3.5 = 6.37
 Difference = 68.4 - 6.37 = 62.03