total travel expenses of $872
transportation cost was $136, the hotel cost was $210 and business materials cost $500, total of these 3: $136 + $210 + $500 = $846
$872 - $ 846 = $26
So his lunch and dinner cost $26
But his lunch cost 30% of his dinner
Lets x is dinner cost
Lunch 30% of dinner cost = 0.3x
x + 0.3x = $26
1.3x = $26
x = $26/1.3
x = $20
So dinner cost $20
Lunch: 0.3x = 0.3 (20) = $6
