Let number of visitor is nNet collection = Rs. n When fee is reduced by 20% New entry fee = Rs. 0.8. Again, let number of visitors increased by m. So, net collection =(m+n)×0.8 Increase in collection (m+n)0.8–n=0.8m–0.2n Percentage increase ⇒
0.8m−0.2n
n
×100=40 80m−20n=40n 80m=60n Percentage increase in number of visitors