7 Kasim has some small jars, some medium jars and some large jars.
He has a total of 400 jars.
3/8 of the 400 jars are empty.
For the empty jars,
number of small jars: number of medium jars 3:4
number of medium jars: number of large jars - 1:2
Work out the percentage of Kasim's jars that are empty small jars.