Try this elder brother ..
Money 50rb
Buy rice 20rb (rest 30rb)
buy pulse 14rb (rest 16rb)
buy siomay 9rb (rest 7rb)
buy fried 6rb (1rb left)
try you answer, that difference or difference or equation or other possible ..
Now the money is 50rb
Buy 25rb pulse (25rb left)
buy 5rb snack (remaining 20)
how do I let the money in buy if added jdi 50rb, and how to let the money who remained if added jdi 50rb ..
I wait for comment from steemit friend
Upvot and follow me @lamela
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Yes @booster