Yes , your total savings on gas proportional to the number of beverages you purchases.
As for every beverage purchased , there is a saving of $0.20
If we show by an equation , where savings is s , and number of beverages is b
Than
s = 0.20 b
Answer:
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TRAVIS AND PAULA SPEND FOR LUNCH 7.50+5.25=12.75 DOLLARS
WE NEED TO FIND OUT HOW MUCH IS 1% OUT OF 12.75 WHICH IS
12.75/100=.1275
.1275*15=1.91 TIP LEFT
12.75+1.91=14.66
Recall Euler's theorem: if
, then

where
is Euler's totient function.
We have
- in fact,
for any
since
and
share no common divisors - as well as
.
Now,

where the
are positive integer coefficients from the binomial expansion. By Euler's theorem,

so that
