A number of subscribers may double in a year.Logical formLearned from7 sentences. A national debt may double in some (peacetime years).Logical formLearned from7 sentences. A rate may be doubled to some percent.Logical formLearned from7 sentences. Costs may double some years.Logical formLearned from7 sentences. (Payroll taxes) may double.Logical formLearned from7 sentences. A firm may double sales of (diamond solitaire engagement rings).Logical formLearned from7 sentences. (House prices) may double.Logical formLearned from7 sentences. A number of (area code) may double.Logical formLearned from7 sentences. A (student population) may double.Logical formLearned from7 sentences. Imports may be doubled.Logical formLearned from7 sentences. An investment may double in value.Logical formLearned from7 sentences. A number of homes may be doubled.Logical formLearned from7 sentences. A workforce may double.Logical formLearned from7 sentences. A number of dead zones may be doubled.Logical formLearned from7 sentences. Times may double.Logical formLearned from7 sentences.