Fractions, decimals and percentages tests (with solutions)

Three tests on fractions, decimals and percentages.
The exercises in the first include converting fractions to percentages, converting decimals to percentages, converting percentages to fractions, working out percentages of given quantities, word problems on percentages and percentage increase and decrease.
The exercises in the second include writing amounts as percentages, working out percentages of a given amount, increasing and reducing an amount by a given percentage and working out the percentage increase or decrease in a word problem. The exercises in the third include working out percentages of a given amount, calculating simple interest, increasing and reducing an amount by a given percentage, working out the percentage change and reverse percentage problems.
Detailed solutions are included.