The Cost Accountant of Tirupati Electronics Ltd. has computed labour turnover rates for the quarter ending 31st March, 1998 as 10%, 5% and 3% respectively under 'Flux Method', Replacement Method', and 'Separation Method'. If the number of workers replaced during that quarter is 30, find out the number of

(a) Workers recruited and joined and

(b) Workers left and discharged.