@PrettyyLisaa

What i did was halves and then round down to the number closest to the answer…. Meaning 
If 18 is 50% of the original price.. the OG price would be 36 we could guess from here that the answer is 30.
But if we want to take it a step further… since we added 10% to the 40% to make it easier, now we have to take 10% from 36 which is 6 which would leave us w 30.😊🎉

@madmaxaviation

Alternative: if you know that the book costs $18 on sale, that means that the price of the book on sale is 60% of original value. Divide $18 by 6 to get $3 which is 10% of original value. X10 to get 100% of original value.

@jeeruchandrasekhar9433

45

@MrGetitRighhtt

You guys are understanding the problem wrong which makes this confusing the answer is 45 you can test by doing 30 x 0.4 and it’ll be $12. The problem says it sold on sale for $18 the answer would be 45.

@George83636

Wrong. Now test it by applying your 40% discount to 30 usd... try... 30 x 0.4 = 12

@JinnMemoirs

He’s right guys chill. The question is the sale is 40% OFF the original price and sale stands at 18$ so 18 is not the 40%

@mwendasimon3769

This is very wrong. The answer is 45.
Can you calculate 40% of 30 and compare with 40% of 45?

@rameshs1129

Another short trick is by using fraction 
60%=3/5
3=18 then reqd price, 5=30

@Jhuniorm

18 divided by .60 equals 30%

@Genero_1

Just type 18÷60% on your calculator.
That's 30

@kit2lateFAN

Orrrrrr just do 18/60 (the remaining percentage)  then 0.3 x 100= 30

@elikinukutabu1068

Wrong the answer is 45

@awinski7988

Wheres the 60 Comes from?

@StephenRayWesley

Awesome 😎👍

@edwinodus

Or (18÷3)×5=30

@shaz3326

The answer is 30

@jaxon1191

or simply just 1800x0.6

@dygorgeous3272

I subscribe because I suck at math and I still suck at it😅

@Euphoria-xe2xp

I didn’t understand about 60%

@JRedcorn86

18×100 ÷ 60.