Cereal flakes are being dried in a vertical dryer by air flowing countercurrent to the cereal. If dry air is used to dry the cereal, the flakes will warp and crack. To prevent breakage of the cereal flakes, $17\mathrm{.}5\%$ of the exit air from the dryer is recycled. For each $1000$ kg$/$h of wet cereal fed to the dryer, calculate the percentage of the water in the air entering the dryer :Data on stream composition $($wet basis$)$: Dry air $0\%$ water; Wet cereal $20\%$ water; Exit air $30\%$ water; Dry cereal $5\%$ water.