Answer these problems. a) Diana has 30 friends. 70% of them are girls and the rest are boys. How many of her friends are boys? b) Robert and Jack go out for a meal. It costs $88. Jack pays 60% of this. How much does he pay?​

a) girls-70%                                                                                                                    

   boys = (100-70)*30:100=9 boys                                                                                       b) He pay 60% of 88$ this means that he spent 0,6*88=52,8$