tmp.sh

#!/bin/bash

bottle=12.5
s=6.95
i=1
tabspace="  "
defmax=5
if [ -z $1 ]; then
   max=$defmax
else
   max=$1
fi

while [[ $i -lt  $max ]]; do
   total=`echo "($i * $bottle) + $s" | bc -l`
   if [[ $i -ge 5 ]]; then
      total=`echo "$total * .95"|bc -l`
   fi
   echo "Bottles: $i"
   echo "${tabspace}Total: $total"
   echo -n "${tabspace}Cost per oz: "
   echo "$total / (3 * $i)" | bc -l
   half=`echo $total / 2 | bc -l`
   echo "${tabspace}50%: $half"
   i=$(($i+1))
done