Help on a few math problems, high school level help much appreciated?

Question

1.) 3/4 x 1/6 x 8/7= A.) 24/168 B.) 2/14 C.) 1/7 D.) None of these.

2.) How many 1/3's of a yard are there in 3/4 of a yard? A.) 6/4 B.) 9/4 C.) 1.5 D.) None of these.

3.) Change 7/8 to a decimal fraction to the nearest hundredth. A.) .8 B.) .87 C.) .88 D.) None of these

4.) Edith purchased a condo for 125,000. If her down payment was 20%, what was her mortgage?

A.) 25,000 B.) 100,000 C.) 150,000 D.) None of these.

5.) Anrie's monthly rent rose from $875 to $950. What was the percentage increase?

A.)75% B.) 7.9% C.)8.6% D.) None of these

Answer 1

1. 3/4 x 1/6 x 8/7 = 24/168 = 1/7.  So the answer is  C.) 1/7.

2. (3/4)/(1/3) = 3/4 x 3/1 = 9/4.  So the answer is B.) 9/4.

3. 7/8 = 0.875  

When rounded up to the nearest 1/100 th, 0.875 ≈ 0.88.  So the answer is C.) 0.88.

4. 20% of $125,000 = $25,000.  So Edith's mortgage was $125,000 - $25,000 = $100,000.  So the answer here is B.) $100,000.

5. To find the % increase, just divide the new rent amount by the old amount.  Then subtract 1 from that result and multiply the remainder by 100:

$950/$875 ≈ 1.0857

1.0857 - 1 ≈ 0.0857  

0.0857 x 100 ≈ 8.57% ≈ 8.6%.  

So the answer here is C.) 8.6%.