Method I Let x= annual income of means multiplication. Rent is 0.3 of his annual income. 1800=0.3×x Divide both sides of the equation by 0.3
1800
0.3
=x Change the decimal to the form whole number ×10−n Where n= number of times you have to move the decimal point to get a whole number. 0.3=3×10−1
1800
3×10−1
=x Note: 3 divides itself once, and 1800, 600 times
1
ab
=a−b
1
10−1
=10−(−1)=101 600×101=x 6000=x Annual income = GH₵6000.00 Method II The whole income is 1 so you can use proportionality to obtain the income. 0.3=1800 1=