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1. Per-pass speed loss in aerobraking ●●○○○ 20 ptsA spacecraft approaches a planet at 18000 m/s and must slow to 8000 m/s over exactly 50 orbital passes. On each pass it keeps the same fraction of its speed. What percentage of its speed must it lose on each pass? Round to two decimal places.
2. Average growth rate from yearly returns ●●○○○ 20 ptsA sum of money grew over 4 years by 25%, 12%, -4% and 10%, one rate per year. Find the average annual growth rate as a percentage. Round to two decimal places.
3. Scout troop after percentage growth ●●○○○ 20 ptsLast year, there were 30 more boys than girls in a scout troop. This year, the number of children in the troop increased by $10\%$, the number of boys increased by $5\%$, and the number of girls increased by $20\%$. How many children are in the troop this year?
4. Uniform annual growth rate ●●○○○ 20 ptsIn a factory, the production of motorbikes was 40,000 in a particular year and rose to 48,400 two years later. Find the uniform annual rate of growth, in percent.