Solve and win Steem SBD

This is simple puzzle to solve and win SBD directly to your account

At the end of the post please read the rules carefully to get reward

Mike,Tom,Charlie and Mike's brother Tommy has returned after visiting the Funpark,
They enjoyed different type of rides and had foods and drinks too
While enjoying various rides and eating and drinking in the park,All fours spent some money on each other,
so now they have to do the math and give back the money to each other for final settlement,

Plz ignore my rubbish picture work

Final settlement is mike has to give 50 $ to tom while tom has to give 10 $ to charlie,
but mike is asking 30 $ from charlie.,now see the picture there's two more transaction left that still mike has to pay 20 $ to tommy and tommy has to give 40 $ to charlie.
To settle this complicated accounting its okay if first one give to second,second one to third and third to fourth but if we don't want to do this lengthy process there's a shortcut to finish this transaction.
so now you have to give answer which is the shortest way to finish this ?minimum how many steps to finish this transaction ?
this is the first puzzle out of ten upcoming
every week a puzzle with 1X reward will be added till 10x
Rules
1:-participant have to follow me.
2:-participant have to upvote and resteem this post.
3:-First ten correct answers will be rewarded.
4:-first 48 hours entry will be valid for reward.
5:-Reward will be 0.1 SBD and it will increase by 1X every week

Promotion purpose only