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There are 3 rules to answering Maths questions:
1) Am I actually answering the question?
2) Have I answered the whole question? (the question above has two parts)
With this question, it's important to realise it's compound interest, meaning you pay interest on your interest.
First, work out how much a 3% increase on the loan is.
Either do this by multiplying £6000 by 1.03 (this is the same as 103%)
Or you can do 6000 x (3/100) to find out the interest, then add the answer to 6000 to work out the total repayment for the first year.
6000 x 1.03 = £6180 for the first year
Or (6000 x (3/100)) + 6000 = £6180
do that for each year, remembering that it's compound interest so for the second year, the sum is £6180 x 1.03, not £6000 x 1.03...
Second year = 6365.3
Third year = 6556.362
Fourth year = 6753.05286
a) How much interest has Jill accrued after 2 years?
At the end of the 2nd year, Jill owes £6365.30 but that's not the answer (remember rule 1). We want to know the interest, not the total repayment.
£6365.30 - £6000 = £365.30
b) What is the total amount to be paid after 4 years?
We've already calculated 6753.05286, but remember units. We don't pay in less than pennies. So rounding the answer, we get £6753.05see more
This is an example of how you can get around not knowing an answer in a multiple choice question by using some basic knowledge and powers of deduction.
(a) "it keeps the cell in shape"
Think about what cells have membranes and what they look like. Animal cells have a membrane and they can be all shapes and sizes (think of a nerve cell which looks spiky compared to a skin cell). Plant cells have a membrane inside their cellulose cell wall. Plant cells are pretty much all the same size and rectangular. So it seems like you need a cell wall to keep a cell in shape.
(d) "It supports the cell structures"
Again, think about what a cell looks like. A blob with a dark circle in the middle (the nucleus). Is the cell membrane touching the nucleus? No. Is it touching other things like mitochondria or ribosomes? No. So let's rule out (d).
(b) "It controls the substances entering and leaving the cell".
(c) "It controls the substances entering the cell"
Often when they put two similar answers they're trying to trick you so make sure you read everything carefully. Here, you might remember that things come into the cell via the cell membrane but you need to remember that cells have to get rid of things too. Everything living (including cells) produce waste that they have to get rid of. Cells respire - they turn oxygen and glucose into carbon dioxide and water - we have to get the CO2 out of our cells and into our lungs to breathe out. We have to get the waste water out or the cell will burst. How will it get out if not through the cell membrane?
So we can conclude that (b) is the answer.see more