A worker earns Tk. 250 on the first day and spends tk. 200 on the second day, earns Tk. 250 on the third day and again spends Tk. 200 on the fourth day and so no. On which day would he have had Tk. 1000?
20th day
30th day
31th day
40th day
.In a group of 135 persons, 50% people contributed tk. 40 each, 30% contributed Tk. 60 each and the remaining persons contributed Tk. 80. Find the average contribution for the group.