b
i
l
l
a
m
o
u
n
t
3
8
.
8
9
t
i
p
p
e
r
c
e
n
t
a
g
e
1
8
t
i
p
a
m
o
u
n
t
=
$
3
8
.
8
9
×
0
.
1
8
t
i
p
=
$
7
.
0
0
b
i
l
l
t
o
t
a
l
w
i
t
h
t
i
p
=
$
4
5
.
8
9