Answer :
- Price of pillow in the department store = $12
 
Solution:
We are given : 
- The wholesale price of the pillow = $7.50
 - The store marks up wholesale price increased by 60%
 
We have to find the price of pillow in department store, which is equal to :
Increase in price of pillow = 60/100 × $7.5
 = 0.6 × $7.5
 = $4.5
Price of pillow in department store = $4.5 + $7.5
 = 12
Hence, price of the pillow in department store is $12.