15500-12%=

$$\small{\text{ $15500-12\% $ }} $\\$ \small{\text{ $=15500-(12\%\ of \ 15500) $ }} $\\$ \small{\text{ $=15500-15500*12\% $ }} $\\$ \small{\text{ $=15500*1-15500*12\% \quad | \quad 1 = \frac{100}{100}=100*\frac{1}{100}=100\% $ }} $\\$ \small{\text{ $=15500*100\%-15500*12\%$ }} $\\$ \small{\text{ $=15500*(100\%-12\%)$ }} $\\$ \small{\text{ $=15500*88\% $ }} $\\$ \small{\text{ $=15500*\frac{88}{100}$ }} $\\$ \small{\text{ $=155*88 $ }} $\\$ \small{\text{ $=13640$ }}$$

15500 - 12% =

first find 12% of 15500

15500 x 0.12

now multiply

1860

subtract 1860 from 15500

15500 - 1860

now subtract

13640

and there's your answer!

P.S. for these just remember that you don't know what 12% of 15500 is, so you have to find it and then plug that number in for 12%

You are missing a zero just on the last line Heureka :)