Answer:
[tex]Expression = 87.6S[/tex]
Step-by-step explanation:
Given
[tex]Cost\ Price = S[/tex]
[tex]Selling\ Price = Cost\ Price +20\% * Cost\ Price[/tex]
Required
Match [tex]73(S + 0.2S)[/tex] with the amount it represents
[tex]Selling\ Price = Cost\ Price +20\% * Cost\ Price[/tex]
Substitute S for Cost Price
[tex]Selling\ Price = S +20\% * S[/tex]
Express 20% as decimal
[tex]Selling\ Price = S +0.20 * S[/tex]
[tex]Selling\ Price = S +0.20S[/tex]
The above represents the selling price of 1 sandwich.
So: [tex]73(S + 0.2S)[/tex] represents the amount for 73 sandwiches
Solving [tex]73(S + 0.2S)[/tex] further
[tex]Expression = 73(S + 0.2S)[/tex]
Evaluate the bracket
[tex]Expression = 73(1.2S)[/tex]
Remove bracket
[tex]Expression = 73*1.2S[/tex]
[tex]Expression = 87.6S[/tex]