exam Maths Puzzle Numerical Ability

What is the relationship between the slopes of perpendicular lines?

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What is one-half of two-thirds of three-quarters of four-fifths of five-sixths of six-sevenths of seven-eights of eight-ninths of nine-tenths of one hundred?
pls dont use algebra to explain Jenny inherits $42,900 and invests it for a year in two stocks. Stock A earns 12.5% annually and stock B earns 8.5% annually. How much did she invest in each stock if stock B earned three-quarters as much as stock A?