Why is my calculation coming up wrong?

If I am wanting to save $35 each week for something specific this would equal the following;Fortnightly saving of $70 ($35 a week x 2 weeks)Monthly sa

If I am wanting to save $35 each week for something specific this would equal the following;

Fortnightly saving of $70 ($35 a week x 2 weeks)
Monthly saving of $140 ($70 a fortnight x 2 weeks)
Yearly saving of $1,680 ($140 a month x 12 months)

Why when i calculate $35 a week x 52 weeks (1 year period) do i get the sum of $1,820?

What am i doing wrong to get two different yearly figures? One of $1,680 and one of $1,820?

I am stumped and a little perplexed why i cannot figure out something as simple as this!?!

or:If I am wanting to save $35 each week for something specific this would equal the following;Fortnightly saving of $70 ($35 a week x 2 weeks)Monthly saving of $140 ($70 a fortnight x 2 weeks)Yearly saving of $1,680 ($140 a month x 12 months)Why when i calculate $35 a week x 52 weeks (1 year period) do i get the sum of $1,820?What am i doing wrong to get two different yearly figures? One of $1,680 and one of $1,820?I am stumped and a little perplexed why i cannot figure out something as simple as this!?!

or:Yes the year has 52 weeks or 26 fortnights. So if you save $70 every fortnight you'll have to time that by 26. That will give you $1820/year. If you look in the calendar you will see that modt months have more than exactly 4 weeks. Most have 4 weeks plus a few days, some have 5 weeks. That's how it happens with the 52/26 calculations. ;-)

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