The total cost of two kinds of goods is 200 yuan. The price of goods a is set at 30% of the cost, and that of goods B is set at 20% of the profit. Later, the two kinds of goods are sold at 90% of the price, and the total profit is 27.7 yuan?

200 × (1 + 20%) × 0.9-200 = 200 × 1.2 × 0.9-250 = 216-200 = 16 (yuan) (27.7-16) / [(1 + 30%) × 0.9 - (1 + 20%) × 0.9] = 11.7 ^ [1.3 × 0.9-1.2 × 0.9] = 11.7 ^ 0.09 = 130 (yuan), then the cost price of commodity B is 200-130 = 70 (yuan). A: the cost of commodity a is 130 yuan, and that of commodity B is 70 yuan

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