Whakaoti i te 200(y+60)+400(y-170)-100000*20%

$$200 ( y + 60 ) + 400 ( y - 170 ) - 100000 \times 20 \%$$

Aromātai

$$600y-76000$$

Ngā Upane Otinga

Whakamahia te āhuatanga tohatoha hei whakarea te 200 ki te y+60.

$$200y+12000+400\left(y-170\right)-100000\times \frac{20}{100}$$

Whakamahia te āhuatanga tohatoha hei whakarea te 400 ki te y-170.

$$200y+12000+400y-68000-100000\times \frac{20}{100}$$

Pahekotia te 200y me 400y, ka 600y.

$$600y+12000-68000-100000\times \frac{20}{100}$$

Tangohia te 68000 i te 12000, ka -56000.

$$600y-56000-100000\times \frac{20}{100}$$

Whakahekea te hautanga \frac{20}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 20.

$$600y-56000-100000\times \frac{1}{5}$$

Whakareatia te 100000 ki te \frac{1}{5}, ka \frac{100000}{5}.

$$600y-56000-\frac{100000}{5}$$

Whakawehea te 100000 ki te 5, kia riro ko 20000.

$$600y-56000-20000$$

Tangohia te 20000 i te -56000, ka -76000.

$$600y-76000$$

Whakaroha

$$600y-76000$$

Ngā Upane Otinga

Whakamahia te āhuatanga tohatoha hei whakarea te 200 ki te y+60.

$$200y+12000+400\left(y-170\right)-100000\times \frac{20}{100}$$

Whakamahia te āhuatanga tohatoha hei whakarea te 400 ki te y-170.

$$200y+12000+400y-68000-100000\times \frac{20}{100}$$

Pahekotia te 200y me 400y, ka 600y.

$$600y+12000-68000-100000\times \frac{20}{100}$$

Tangohia te 68000 i te 12000, ka -56000.

$$600y-56000-100000\times \frac{20}{100}$$

Whakahekea te hautanga \frac{20}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 20.

$$600y-56000-100000\times \frac{1}{5}$$

Whakareatia te 100000 ki te \frac{1}{5}, ka \frac{100000}{5}.

$$600y-56000-\frac{100000}{5}$$

Whakawehea te 100000 ki te 5, kia riro ko 20000.

$$600y-56000-20000$$

Tangohia te 20000 i te -56000, ka -76000.

$$600y-76000$$