Yoko has just bought a new computer ($2000), a printer ($400), and a scanner ($210). She wants to use the monthly payment option. There is a monthly interest of 2 percent on her purchase. a. If Yoko pays $100 per month, how long does it take to complete her payments? (Round up to the nearest whole number.) b. If Yoko wants to finish paying in 24 months, how much will her monthly payment be? (Round up to the nearest cent.)