Whakaoti mō r
r=\frac{3}{100}=0.03
Tohaina
Kua tāruatia ki te papatopenga
1+4r=\frac{2240000}{2000000}
Whakawehea ngā taha e rua ki te 2000000.
1+4r=\frac{28}{25}
Whakahekea te hautanga \frac{2240000}{2000000} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 80000.
4r=\frac{28}{25}-1
Tangohia te 1 mai i ngā taha e rua.
4r=\frac{28}{25}-\frac{25}{25}
Me tahuri te 1 ki te hautau \frac{25}{25}.
4r=\frac{28-25}{25}
Tā te mea he rite te tauraro o \frac{28}{25} me \frac{25}{25}, me tango rāua mā te tango i ō raua taurunga.
4r=\frac{3}{25}
Tangohia te 25 i te 28, ka 3.
r=\frac{\frac{3}{25}}{4}
Whakawehea ngā taha e rua ki te 4.
r=\frac{3}{25\times 4}
Tuhia te \frac{\frac{3}{25}}{4} hei hautanga kotahi.
r=\frac{3}{100}
Whakareatia te 25 ki te 4, ka 100.
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