Solution:
We are given that lena sells cosmetics and recieves commissions of 45%.
She sold $200 worth of cosmetics to one customer.
It mean she will get a commission of 45% on $200. So we will find 45% of 200 and the resulting value will be the comission of Lens.
45% of 200

Comission recieved

It mean that when leena sells cosmetics of $200, she gets a comission of $90.