How to solve mathematics problem profit loss लाभ – हानि, railway groupd,railway alp, rpf, ssc, bank

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The way to clear up arithmetic downside revenue loss लाभ – हानि, railway groupd,railway alp, rpf, ssc, financial institution, finest trick…
half – 1 https://youtu.be/MSNrSIeEnDY
half – 2 https://youtu.be/XyAGqqo6SOw

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