Medha deposited 20% of her money in a bank. after spending 20% of the remainder, she has 4800 left with her. how much did she originally have?
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first off, let's convert the 20% to a fraction, so we can do so by simply dividing the percentage form by 100, 20/100 = 1/5, so 20% of whatever is really just 1/5 of that.

let's say the total amount is "x".

she deposited 1/5 of "x" in the bank, so she was left only holding

then she spent 1/5 of that remainder, and that happened to be 4800 bucks.

how much is 1/5 of (4/5)x?   well is simply their product.

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step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.