Sale by former owner of forfeited land; old tax shall be paid on sale of whole tract; seventy-five per cent on sale of part

The forfeited land commission shall not give its approval for the sale of the entire lot or tract unless the owner pays all taxes which may at any time be due thereon. In case the owner petitions the commission to sell a part thereof and the commission shall deem it advisable to permit such sale, the owner shall pay to the forfeited land commission from the proceeds of the sale of such part or portion of the property involved not less than seventy-five per cent of the entire sale price, unless a smaller amount is sufficient to pay all taxes due, and upon such payment the commission shall release the lien for taxes on the property so sold.