Kindly solve

1. find the effective rate of interest of 9.9% p.a calculate monthly

a).9.9%                                                                                                                                                                              b).11.36%

c).9.36%                                                                                                                                                                            d).10.36%

2. if the SI. on 1400/- at ertain rate of interest for 3 years is less than that on 1800/- for the same period & same rate of interest 80/- then the rate of interest is

a). 6.67%                                                                                                                                                                         b).7.67%

c).5.67%                                                                                                                                                                              d).none