#!/bin/sh

read -p "X resolution, pixels (720):" x 
read -p "Y resolution, pixels (480):" y 
read -p "frames per second    (30):" f 

echo Uncomperessed vieo bandwidth == \
`expr 10 \* ${x:=720}  \* ${y:=480} \* 2 \* ${f:=30} / 1048576 | sed -e 's/\(.\)$/\.\1/'`\
Mb/sec