2008 xIMC keystage2-EMIC team Question 4

Group $A$: $\frac16,\frac1{12},\frac1{20},\frac1{30},\frac1{42}$. Group $B$: $\frac18,\frac1{24},\frac1{48},\frac1{80}$. Group $C$: $2.82,2.76,2.18,2.24$. Choose one number from each and multiply. Find the sum of all $80$ products.