can sender send 2 amounts to single recipient in single transaction? I am working on web-app that needs to send money to customer's addresses. 

i am trying find out if is it possible to ,
Bitcoin sender to send 2 or more amounts to single address in single transaction ?

e.g.

Transaction 1-&gt;
               sender1 -&gt; (20 satoshis)-&gt; receiver 1
                       -&gt; (40 satoshis)-&gt; receiver 1


Is this possible ?

i know i can add both amounts and do single transaction. but i would like to know can this be doable ?
Yes. This sort of transaction is doable in bitcoin.

A point which I would like ot highlight is that transaction fees in bitcoin are proportional to the transaction size in bytes(and not the amount being sent). So, splitting the amount into 2 outputs will cost you more than combining the outputs.