The pictograph below shows how many envelops were sold by a post office during a week. Use the pictograph to answer the following questions

(i) How many envelops were sold on Wednesday?

(ii) On which day, maximum number of envelops were sold?

(iii) If cost of one envelop is 5, find the revenue generated by selling envelops on Monday.

(iv) How many envelops were sold during the week ? Find the revenue generated by selling envelops during the week.