In the following chart, the price of logs shown is per cubic meter and that of plywood and saw timber is per ton. Given that $1$ cubic meter of Plywood and Saw Timber = $800$ kg ($1$ ton = $1000$ kg)
If the volume sales of Plywood, Saw Timber and Logs were $40$%, $30$% respectively, what was the average realisation in $1993$ per cubic meter of sales?
- $18$
- $15$
- $16$
- $13$