document.write( "Question 836211: You are at a restaurant and the total bill, including meal (food & tax) is $85.00. You left an 18.5% tip. How much was the meal?\r
\n" ); document.write( "\n" ); document.write( "I assume this is how much is the meal w/tax? Right? Because you can't know the rate of the tax from the information given.
\n" ); document.write( "$85.00
\n" ); document.write( "-18.5 % ($15.73)
\n" ); document.write( "equals
\n" ); document.write( "$69.27paid for the meal including taxes \n" ); document.write( "
Algebra.Com's Answer #504031 by KMST(5328)\"\" \"About 
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Actually, if you spent a total of $85.00 including meal, tax(if any) and tip, your meal (with tax if restaurant meals are taxed in the state/country where you ate) was $71.73, and you left a tip of 18.5% of $71.73, which added $13.27 for a total amount spent of
\n" ); document.write( "$71.73 + $13.27 = $85.00.
\n" ); document.write( "
\n" ); document.write( "Here is how I calculate it:
\n" ); document.write( "\"x\"= amount, in $, billed for food plus tax (if any)
\n" ); document.write( "\"0.185x\"= amount, in $, left as tip
\n" ); document.write( "\"x%2B0.185x=%281%2B0.185%29x=1.185x\"= total amount spent, in $.
\n" ); document.write( "The equation I get is \"1.185x=85\" and I solve it by dividing
\n" ); document.write( "\"x=85%2F1.185\"
\n" ); document.write( "I do not get an exact number.
\n" ); document.write( "I get $71.72996 (rounded to 5 decimal places).
\n" ); document.write( "It rounds to 71.73.
\n" ); document.write( "If 71.73 was the amount, in $, billed for food plus tax (if any),
\n" ); document.write( "\"71.73%2A0.185=13.27005\" would be the 18.5% tip (18.5% of 71.73).
\n" ); document.write( "You would round that to 13.27, and
\n" ); document.write( "\"71.73%2B13.27=85.00\" \n" ); document.write( "
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