Lets be a price of the calculator - $ a then , after using the coupon, you need to pay $(a-18) and after using 15% discount , you need to pay (1-0.15)a=0.85a
then, if (a-18) will be more than 0.85a, you should prefer 0.15 % discount, because it will be cheaper,
a-18> 0.85a a-0.85a>18 0.15a > 18 a>120, that means that if the price of the calculator more than $120, 15% discount is better, but if the price of the calculator is less than $120, you should choose $ 18 coupon.
for example, we have the price of the calculator $100 100-18=82, 100*0.85 =85, coupon is better.
If the price of the calculator $200 200-18=182, 200*0.85=170, so 15% discount is better
if price of the calculator is $120, 120-18=102 120*0.85=102, it will not matter, what you are going to use, because you are going to pay the same amount of money
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It is easy the left side as to be ten times greater then your
right side for example my ones place is ten times greater my tens place
is ten times greater than my hundreds place and my hundreds place is ten
times greater than my thousands place i hope this will help you bye
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