'A departmental store receives a shipment of 1000 pens, for which it pays Rs. 9000. The store, sells

"A departmental store
receives a shipment of 1000 pens, for which it pays Rs. 9000. The store,
sells the pens at a price 80 percent above cost for one month, after which it
reduces the price of the pens to 20 percent above cost. The store, sells 75
percent of the pens during the first month and percent of the 50. remaining
pens afterwards. How, mach gross income did the sales of the pens generate?
`R s .10000`
b. `R s .10800`

c. `R s .12150`
d. `R s .13500`"

sells