Whakaoti i te =75*60-480*0.8*18/75*4.119

$$= \frac { 75 * 60 - 480 * 0.8 * 18 } { 75 * 4.119 }$$

Aromātai

$$-\frac{10720}{1373}\approx -7.80772032$$

Ngā Upane Otinga

Whakareatia te 75 ki te 60, ka 4500.

$$\frac{4500-480\times 0.8\times 18}{75\times 4.119}$$

Whakareatia te 480 ki te 0.8, ka 384.

$$\frac{4500-384\times 18}{75\times 4.119}$$

Whakareatia te 384 ki te 18, ka 6912.

$$\frac{4500-6912}{75\times 4.119}$$

Tangohia te 6912 i te 4500, ka -2412.

$$\frac{-2412}{75\times 4.119}$$

Whakareatia te 75 ki te 4.119, ka 308.925.

$$\frac{-2412}{308.925}$$

Whakarohaina te \frac{-2412}{308.925} mā te whakarea i te taurunga me te tauraro ki te 1000.

$$\frac{-2412000}{308925}$$

Whakahekea te hautanga \frac{-2412000}{308925} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 225.

$$-\frac{10720}{1373}$$

Tauwehe

$$-\frac{10720}{1373} = -7\frac{1109}{1373} = -7.8077203204661325$$