To find a given percentage of a given number, we can transform the percentage into decimal and multiply it by the number.
So, 98% can be written in the decimal form by deviding it by 100%:
[tex]98\%=\frac{98\%}{100\%}=0.98[/tex]Since they are equivalente, we can now multiply it by 18:
[tex]0.98\cdot18=17.64\approx17.6[/tex]Thus, 98% of 18 is approximately 17.6.