Space Usage Calculator

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#
# Space usage calculator
#
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for i in 1
do
  echo -e "\n\nSpace Calc "
  echo -e "Enter TOTAL size: \c"
  read X
  echo -e "Enter USED size:  \c"
  read Y
  B=`echo "scale=2;"${Y}/${X}*100 | bc -l`
  echo -e "Space Usage: ${B}%\n"
  echo -e "Enter required USED %:  \c"
  read A
  C=`echo "scale=2;"${X}/100*${A} | bc -l`
  D=`echo "scale=2;"${Y}-${C} | bc -l`
  echo -e "Required increase: ${D} for ${A}%\n\n"
done