If a laptop originally costs $800 at purchase, and is then discounted by
10%, the remainder would be $720, given that 10% of $800 is $80.
Therefore, once then applying the credit card to reduce it another $150,
the final price of the laptop would come out to $570 once the
deductions are considered.
I don’t understand what you are asking for
The calculations for 2, 4, 8 year can be derived as follows,
For simple interest:
S.I = 
P= principle
T= Time
R= Rate
For 2 year;
S.I =
= $224
Amount = $2224
For 4 year;
S.I =
= $448
Amount = $2448
For 8 year;
S.I =
= $896
Amount = $2896
lox (x) = -5
rewrite the equation in exponential form:
10^-5 = x
10^-5 = 1/10000
1/10000 = 0.00001
That is the correct answer.