Aptitude- Numerical Word Problems- Percentages

Sean and Dean are two brothers renting an apartment together. They are concerned that they might not be able to keep up with the rent of their current apartment throughout the whole period of their studies.
Due to an increase of population in the city where they live, rents rise every year. Two years ago the prices increased by 15% and have been increasing ever since by a growing percentage. Each year 10% of the previous percentage is added to form the new yearly percentage.
Sean will graduate next year and Dean will graduate in 3 years time. 
If Sean and Dean are currently paying £1100 per month and cannot afford to pay more than £1,320, which of the brothers will be able to sustain the living costs and remain in the apartment until graduation?

*Assume that graduation occurs at the end of a given year (i.e. in December).

A mobile company offers insurance that covers cases of theft and accidental water damage. According to their policy, the insurance pays 60% and 50%, respectively and with a £30 deductible. This means the client pays the first £30, after which the insurance pays 60% in the case of a theft and 50% in the case of accidental water damage. How much will a client pay if her cell phone worth £1,080 was stolen?

A mobile company offers insurance that covers cases of theft and accidental water damage. According to their policy, the insurance pays 60% and 50%, respectively and with a £30 deductible. This means the client pays the first £30, after which the insurance pays 60% in the case of a theft and 50% in the case of accidental water damage. How much will a client pay if her cell phone worth £1,080 was accidentally dropped into a glass of water?

In 2012 Mary earned $80,000. If Mary's salary decreases by 10% each year, when will she earn $58,320?

In one sample of 2,048 the percentage of people with blonde hair is 37.5%. In a different sample of 312 the percentage of people with green eyes is 87.5%. One of the researchers discovers some errors were made in the calculations. The number of people with blonde hair in the first sample was actually 162.5% of the reported number. Furthermore, the number of people with green eyes in the second sample was actually 33.33% of the reported number. How many more or less people with blonde hair were there actually in the first sample when compared to the actual number of people with green eyes in the second sample?

Joan, Kate and Lara order a pizza. One-quarter of the pizza is topped with only mushrooms and is divided into four equal pieces. Another third of the pizza is topped with only peppers and is divided into three equal pieces. The rest of the pizza is topped with only onions and is divided into two equal pieces. If Kate only eats two pieces of pizza, which of the following choices could NOT be the total percentage of pizza eaten by Kate?

Janet is at the local pub, drinking a White Russian. This cocktail is usually made of coffee liqueur (40 to 50 percent), cream (10 to 25 percent) and vodka. Vodka contains 40% alcohol, and coffee liqueur contains 10% alcohol. If the whole drink contains 200ml, how much alcohol does Janet consume by drinking it (in ml)?

A bookstore sells books at a profit of at least 15% of the final selling price. The store buys a certain book at a cost of £17. If the store gives students a 20% discount, what should the selling price of the book before the discount be?