In the first quarter of the year, Jean spent 72% of her salary. In the next 4 months, she saved 25% more than what she saved in the first quarter of the year. If Jean's monthly salary of $1800 remained the same through out the year, what was her average monthly expenditure for the first seven months?

I did this question about four times and I keep on getting $1314 but the book says the answer is $1224. Could someone help me on this?

Sue wanted to cut a piece of ribbon into two smaller pieces. At first ,she wanted the first piece of ribbon to be 210cm long. Then she changed her mind and decided to reduce it by 20cm. This would increase the length of the second piece by 8%. What was the total length of the whole piece of ribbon before Sue cut it?

If 20 cm = 8%

then 10 cm = 4 %

250 cm = 100%

then this makes the second piece 250 cm plus 190cm should be 440cm but the book says the answer is 460cm . Did I do something wrong?

Two sisters, Mary and Julia shared $72. When their mother gave them another $10 each, Julia has 16% less money than Mary. What is the ratio of the amount of Mary's money to Julia's money at first?

Mary - Julia =16% of 92

I tried to sovle it this way but it didn't work.

Is the equation wrong?

I am trying to stop using guessing and checking to get the answers.

Vicky.

Thanks