百分比（12岁以上）
Percentages (age 12+)
解决涉及百分比增加、百分比减少、在百分比变化后求原值以及计算单利的问题。
Solve problems involving percentage increase, percentage decrease, finding the original value after a percentage change, and calculating simple interest
学习证据 / Evidence
- 使用小数乘数（×1.15）计算 240 英镑增加 15% 后的金额。
- 已知打八折（降价 20%）后的售价为 64 英镑，求原价。
- 按年利率 3% 计算 500 英镑存 4 年的单利。
- Calculate a 15% increase on £240 using a decimal multiplier (× 1.15)
- Find the original price before a 20% discount resulted in a sale price of £64
- Calculate simple interest on £500 at 3% per annum for 4 years
评估问题 / Assessment
如果一辆自行车原价 250 英镑，价格上涨 8%，{{name}}能算出新价格吗？如果储蓄账户每年按 3% 的单利计息，500 英镑存 4 年能获得多少利息？
If a bike originally costs £250 and its price goes up by 8%, can {{name}} work out the new price — and if a savings account earns 3% simple interest per year, how much interest would £500 earn in 4 years?