<Ul> <Li> Custom </Li> <Li> Duty </Li> <Li> Tariff <Ul> <Li> Import </Li> <Li> Export </Li> </Ul> </Li> <Li> Tariff war </Li> <Li> Free trade </Li> <Li> Free trade zone </Li> <Li> Trade agreement </Li> </Ul> <Li> Tariff <Ul> <Li> Import </Li> <Li> Export </Li> </Ul> </Li> <Ul> <Li> Import </Li> <Li> Export </Li> </Ul> <Li> Free trade zone </Li>

Define total income and gross total income under income tax act