Verified Answer :

40% can be written in decimal form as 0.4.
If I multiply $50 by 0.4:
($50)(0.4)= $20

That means that 40% of $50 is $20.
So, you spend $20 on lunch.

apologiabiology

percent means parts out of 100 so
40%=40/100=4/10

'of' can be translated as multiply
50 times 4/10=200/10=20

$20=lunch

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