Answer:
$ 0.729 p
Step-by-step explanation:
January price of the Item = $ p, 10% of p = $ 0.1 p
February price of the item = $ p - $0.1 p = $ 0.9 p
10% of $ 0.9 p = $ 0.09 p
March price of the item = $ 0.9 p - $ 0.09 p = $ 0.81 p
10% of $ 0.81 p = $ 0.081 p
April price of the item = $ 0.81 p - $ 0.081 p = $ 0.729 p