Xiaoli’s family plans to buy a washing machine at 2,980 yuan. Her father’s salary is 2,380 yuan, her mother’s salary is 1,820 yuan, and her monthly living expenses are 1,800 yuan. She also needs to give 1,000 yuan to her grandparents. How many months will it take for a family to buy a washing machine?
小丽家计划要买一台2980元的洗衣机，爸爸的工资是2380元，妈妈的工资是1820元，每月的生活开支是1800元，还要给爷爷奶奶每个月1000元的生活费，小丽家需用几个月才能买一台洗衣机？
<result>3</result>