Question

В июле стиральная машина стоила на 10% меньше, чем в апреле того же года, а в декабре эта модель подешевела ещё на 30%. На сколько процентов по сравнению с ценой в апреле понизилась цена этой модели стиральной машины после удешевления в декабре?

Answer 1

30 процентов - 10 процентов=20

Answer 2

Calculation of Price Reduction

To calculate the percentage by which the price of the washing machine decreased compared to the price in April, we need to consider the two price reductions that occurred in July and December.

In July, the washing machine was 10% cheaper than in April, and in December, the price of the same model decreased by an additional 30%. We want to find the total percentage decrease in price compared to April.

Let's calculate it step by step:

1. Calculate the price after the July reduction: - The price in July is 10% lower than the price in April. - Let's assume the price in April was $100. - The price in July would then be $100 - (10% of $100) = $90.

2. Calculate the price after the December reduction: - The price in December is 30% lower than the price in July. - The price in July was $90. - The price in December would then be $90 - (30% of $90) = $63.

3. Calculate the percentage decrease compared to April: - The price in April was $100. - The price in December is $63. - The percentage decrease can be calculated as ((100 - 63) / 100) * 100 = 37%.

Therefore, the price of this washing machine model decreased by 37% compared to the price in April after the reduction in December.