2.5kg cost £1.40
what is the cost of 4.25kg

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

If 25% of y is 30, what is 60% of y?

If you answer 2+2 you will get over 80 points