Alex has \$20 and Bobbie \$25.

(a(i)) Find Alex:Bobbie in simplest form. [1]

(a(ii)) Each spends 1/5 of their money. Find the ratio remaining. [1]

(a(iii)) They then each spend \$4. Find the new ratio remaining. [2]

(b(i)) A town’s population was 15600 in 1990 and is now 11420. Find the percentage decrease. [3]

(b(ii)) 15600 was 2.5% less than the 1980 population. Find the 1980 population. [3]

(c) Chris invests \$200 at x% simple interest per year. Total interest after 15 years is \$48. Find x. [2]

(d) Dani invests \$200 at y% annual compound interest. After 10 years it is worth \$256. Find y to 1 decimal place. [3]