Question
One durian cost 4 times as much as one starfruit. Mrs Zhang bought 4 durians and 2 starfruits for $20.40. How much would 10 durians and 5 starfruits cost? Express the answers to 2 decimal places.
3 m

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One durian cost 4 times as much as one starfruit. Mrs Zhang bought 4 durians and 2 starfruits for $20.40. How much would 10 durians and 5 starfruits cost? Express the answers to 2 decimal places.