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Sagot :
Karl Schwartz's lunch cost $25
Karl Schwartz total travel expenses comprises of transportation cost, lodging cost, dinner cost, lunch and additional cost.
In order to determine the cost of lunch, the first step is to determine the total cost of dinner and lunch.
Cost of lunch and dinner = total travelling expenses - sum of costs
$643 - ($290 + $198 +$80)
$643 - $568
Cost of lunch and dinner = $75
Let x represent the cost of lunch
cost of dinner = 2x
2x +x = 75
3x = 75
x = $25
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