Using Taylor's plan, calcuate the earnings of workers from the following information $.$ Normal rate per hour Rs$\mathrm{.}12$ standard time per pieces::$20$ minutes. In a $9$ hour day $,$ worker A produces $26$ units and worker B produces $30$ units.Differentials to be applied $80\%$ of piece rate for below standard $120\%$ of piece rate aT OR for above standard