Many ways to make the same amount.

At the bazaar, people pay with notes and coins. Sellers need to count money quickly. Knowing the value of each note helps.
Notes have bigger values than coins. ৳100 is the same as ten ৳10 notes. ৳50 is the same as five ৳10 notes.
To count money, start with the biggest note. 20, 30, 35, 37. The amount is ৳37.
There are many ways to make ৳50. Using fewer notes is easier to carry. Can you find another way?